Derivation of the Capstan Equation - Frictional Force due to a String Wrapped Around a Circle Dot Physics 2026-09-18 | Derivation of the Capstan Equation - Frictional Force due to a String Wrapped Around a Circle
Electrodynamics: Calculating the Change in Potential Through an Insulator Dot Physics 2025-10-23 | You can't really calculate the electric field inside of a polarized insulator. Instead, we can calculate the change in potential by going around the material.Here' s the python codetrinket.io/glowscript/37afcc3dc339Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Does Gausss Law Really Work with Dielectric Materials? Dot Physics 2025-10-23 | If you have a charge surrounded by a spherical shell dielectric, the electric field outside looks like the shell isn't even there - but that's not always the case.Here's an example with a charge and a non-spherical dielectric.Python code heretrinket.io/glowscript/31268eca4acfHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Change in potential for plates with dielectrics Dot Physics 2025-10-17 | The space between plates of a parallel-plate capacitor is filled with two slabs of linear dielectric material. Each slab has a thickness a, so the total distance between the plates is 2a. Slab 1 has a dielectric constant of 2, and slab 2 has a dielectric constant of 1.5. The free charge density on the top is plus sigma and on the bottom plate minus sigma.What is the displacement field? What is the electric field? What is the change in potential?Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the potential inside a rubber coated charged sphere Dot Physics 2025-10-17 | A metal sphere of radius a carries a charge Q. It is surrounded, out to a radius b, by linear dielectric material of permittivity epsilon. Find the potential at the center (relative to infinity).Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Here are two ways to solve this #electrodynamics problem- #gausslaw and #displacementfield. #physics Dot Physics 2025-10-15 | ...
Electrodynamics: Modeling a Polarized Shell with Python Dot Physics 2025-10-14 | In a previous video, I calculated the electric field inside and outside a dielectric material. Here's the video.youtu.be/I6yWKB9CO3ANow, let's see if we can model this same field using 2000 internal dipoles. Here's the python code.trinket.io/glowscript/49efb6a9d69aHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the electric field around a polarized shell Dot Physics 2025-10-14 | Griffiths Chapter 4.Problem 4.15A thick spherical shell (inner radius a, outer radius b) is made of a dielectric material with a "frozen-in" polarization.P = k*rhat/rwhere k is a constant and r is the distance from the center. Find the electric field in all three regions by two different methods.Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Introduction to the Displacement Field Dot Physics 2025-10-13 | In this video:1. What is polarization and the dipole moment2. Free charges vs. bound charges3. Gauss's Law4. Derivation of displacement field5. Why?Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Polarization and Surface Charge Density Dot Physics 2025-10-09 | What is the polarization vector and how is it related to the surface charge density?Here is my very basic derivation along with a python calculation for the surface charge density on an insulating sphere.Code here:trinket.io/glowscript/8f720cc084caHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Polarization and the Interaction Between Charges and Matter Dot Physics 2025-10-08 | Starting chapter 4 of Griffith's Introduction to Electrodynamics. Here we look at the polarization of an atom due to a charge and then calculate the force between the charge and neutral atom.After that, I model the interaction between a point charge and an insulating cube using python. Here is the codetrinket.io/glowscript/67875fbcb878Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electric Field for Water Molecule Using the Dipole Moment in Python Dot Physics 2025-10-07 | There are two ways to calculate the electric field due to a water molecule. First, we could just calculate the field due to the point charges. Second, we could calculate the dipole moment and use that.
Electrodynamics: Calculating the Electric Dipole Moment For Water Dot Physics 2025-10-06 | Here is a comparison between the actual electric field and the dipole field for water.python code heretrinket.io/glowscript/7110267c9173Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Two Versions of the Electric Field due to a Dipole Moment Dot Physics 2025-10-03 | There's the easier to derive form of the electric dipole moment using spherical coordinates. But there is also a version that works better with Cartesian coordinates.Here is my python codetrinket.io/glowscript/e8862fe28b18Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electric Field and Potential due to Dipole with Python Dot Physics 2025-10-03 | Here is how to make a quiver and contour plot in python. For this, you will need:Jupyter notebooks - anaconda.comVPython - vpython.org
Electrodynamics: Plotting the Potential and Electric Field for a Dipole with Python Dot Physics 2025-10-02 | In this video, I'm creating a contour plot and quiver plot with matplotlib from python.You will need to install two things: all the python stuff: anaconda.comVPython: vpython.orgHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the Electric Potential and Field due to a Dipole Dot Physics 2025-09-29 | Electrodynamics chapter 3:How do you derive the electric potential and field due to a dipole? Bonus visualization with pythonHere is the python codetrinket.io/glowscript/5feabdff5b39Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Solving Laplace Equation for Potential Using Python Dot Physics 2025-09-26 | Here's how to use Jupyter notebooks python to determine the electric potential in a region with boundary conditions.Here is the python codecolab.research.google.com/drive/1p9AZV6cNmEzKR8Dvva_efE6JxDGsnSlG?usp=sharingHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Finding the electric potential with Python and the finite difference method Dot Physics 2025-09-24 | Suppose you have a 2D region in space with electric potential boundary conditions. We can use finite values of potential and the relaxation method to calculate the potential in this space.
Electrodynamics: Finding Potentials with Boundary Conditions Using the Finite Difference Method Dot Physics 2025-09-23 | From Griffiths chapter 3 In a previous video (here youtu.be/M3RDynwsFuw ) I used separation of variables to find the electric potential in a 2D space.In this video, I'm going to repeat the calculation using finite values of the potential and the relaxation method in python.Here is the python codetrinket.io/glowscript/0e378f033144Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Using Separation of Variables to Find the Electric Potential Dot Physics 2025-09-22 | From Griffiths chapter 3 Two infinite grounded metal plates lie parallel to the xz plane, one at y = 0, the other at y = a. The left end, at x = 0, is closed off with an infinite strip insulated from the two plates and maintained at a specific potential Vo(y). Find the potential inside this “slot.”Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics method of images Dot Physics 2025-09-17 | How does the method of images work in #electrodynamics #physics?
Electrodynamics: Charge Near a Conducting Plate, Modeling with Python Dot Physics 2025-09-16 | From Griffiths chapter 3 In a previous video, we looked at the method of images to find the potential due to a charge and a grounded conductor. In this video, we model the motion of charges in the plate with a many body problem. Here is the previous video:youtu.be/ePjfCd1UaQ8Here is the python code.trinket.io/glowscript/21360ba6515dHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the Potential Using Method of Images Dot Physics 2025-09-16 | From Griffiths chapter 3 Find the electric potential due to a charge above a flat conductor. What is the charge density on the plate and what is the total charge?Yes, my final answer is off by a factor of 2 - I'm sure it was just a silly mistake. Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Do UAPs Conserve Momentum? A Physics Video Analysis of a Collision with a Missile Dot Physics 2025-09-15 | A UAP is an Unknown Aerial Phenomena - previously called a UFO. There was a video shared during the House Oversight Committee’s Task Force on the Declassification of Federal Secrets that showed a collision between a hellfire missile and an unknown orb looking thing. You can see the full video here:youtu.be/1va2J248nuE?si=HS6Cx8LnodFE6OApUsing conservation of momentum, and video analysis, we can get an estimate for the mass of the orb. Here, I'm using Tracker Video Analysisopensourcephysics.github.io/tracker-websiteHere is the python code for the visualization (with the data)trinket.io/glowscript/a02e16bc366bFinally, here is a video showing how to model collisions in pythonyoutu.be/miqlwBXxWJE
Taking the second derivative as a finite difference Dot Physics 2025-09-12 | In #physics, sometimes we solve differential equations with boundary conditions using the finite difference for derivatives. Here's how that works.
Electrodynamics: Solving the 1D Laplace Equation with Python and the Finite Difference Method Dot Physics 2025-09-11 | From Griffiths chapter 3. The Laplace equation in 1D is fairly straightforward (it's literally a line). However, this is a good opportunity to practice solving it numerically.Here is the python codetrinket.io/glowscript/158f44d77526Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding a 1D Potential in Free Space Using Laplaces Equation Dot Physics 2025-09-11 | From Griffiths chapter 3 Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Introduction to Capacitance and Electric Field Energy Density Dot Physics 2025-09-10 | From Griffiths chapter 2. In this video:- Electric field due to a plate- Electric field due to parallel plates- Electric potential between two plates- Capacitance- Energy density of electric fieldHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the electric potential due to a uniform charged sphere Dot Physics 2025-09-05 | From Griffiths chapter 2. Problem 2.21Find the potential inside and outside a uniformly charged solid sphere whose radius is R and whose total charge is q. Use infinity as your reference point. Bonus: Numerical calculation with python: Here is the code.trinket.io/glowscript/b999fe3746bbDouble bonus: finding the electric potential for a shell of chargeHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Differential form of Gausss Law: spherical vs Cartesian divergence Dot Physics 2025-09-05 | The #divergence theorem uses the "dell" operator. It's pretty easy to write this in cartesian coordinates. But what happens if your electric field is in #sphericalcoordinates? You can either use the much more complicated del operator in spherical coordinates, or you can change your electric field to cartesian coordinates.
Relationship between #electricfield #chargedensity and #electricpotential Dot Physics 2025-09-04 | ...
Python Physics: 3D Model of Gausss Law for a Sphere Dot Physics 2025-09-03 | With Gauss's Law, we normally pick a surface that makes the flux calculation simple. But what if we don't do that? Here's how to model and visualize the flux through a sphere for any point charge located anywhere.Here is the python codetrinket.io/glowscript/021d6b35f6b4Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Integral and differential form of Gauss Law #physics #maths #electrodynamics Dot Physics 2025-09-02 | ...
Electrodynamics: Visualizing the Electric Flux with VPython Dot Physics 2025-09-01 | From Griffiths chapter 2. Problem 2.10Find the electric flux through one side of a cube. In this case, I create a 3D model of the area and the field to visualize the flux. Here is the python code.trinket.io/glowscript/980df792833cHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Calculating the Electric Flux through a Square Dot Physics 2025-09-01 | From Griffiths chapter 2. Problem 2.10A charge q sits at the back corner of a cube. What is the flux of E through the shaded side?Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Electrodynamics: Finding the Charge Density Dot Physics 2025-09-01 | From Griffiths chapter 2. Problem 2.9Suppose the electric field in some region is found to be E = kr^3 in the spherical coordinates. a) find the charge density rho. b) find the total charge in a sphere of radius RHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Numerical Model to Find the Electric Field due to Spherical Shell Dot Physics 2025-08-28 | From Griffiths chapter 2. Problem 2.7Find the electric field a distance z from the center of a spherical surface of radius R that carries a uniform charge density sigma. Tread the case z less than R (inside) as well as z greater than R (outside).In this case I use a numerical model to calculate the field. Here is the code.trinket.io/glowscript/57772a76ebffHere is the previous video (setting up the solution with an integral)youtu.be/g_h_hQwMOAIHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Electric Field due to a Uniform Spherical Shell Dot Physics 2025-08-28 | From Griffiths chapter 2. Problem 2.7Find the electric field a distance z from the center of a spherical surface of radius R that carries a uniform charge density sigma. Tread the case z less than R (inside) as well as z greater than R (outside).In this case I use a numerical integration to solve evaluate the final integral. Here is the code.trinket.io/glowscript/63b4ba968d81Here is the second video with a numerical model for a finite number of chargesyoutu.be/kyxtkrNrWoQHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: 3D Quiver Plot in VPython Dot Physics 2025-08-27 | This might be useful for my Intro to Electrodynamics course. Here is how to make a 3D quiver plot (showing the electric field in space) using VPython.Here is the codetrinket.io/glowscript/3699aa399011Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Griffiths Chapter 2 Summary Dot Physics 2025-08-26 | This is a summary of chapter 2.In this video:- Electric field due to a point charge.- Electric field due to charge distribution - Gauss's Law- Differential form of Gauss's Law- Electric potential- CapacitorsHere is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Finding the Electric Field due to a Ring with Python Dot Physics 2025-08-23 | From Griffiths chapter 2/ Problem 2.5Find the electric field a distance z above the center of a circular loop of radius r that carries a uniform line charge lambda.Here is the python codetrinket.io/glowscript/c46944f71d06
Intro to Electrodynamics: Electric Field due to a Ring Dot Physics 2025-08-23 | From Griffiths chapter 2/ Problem 2.5Find the electric field a distance z above the center of a circular loop of radius r that carries a uniform line charge lambda.Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Calculating the Electric Field with Numerical Methods Dot Physics 2025-08-22 | From Griffiths chapter 2. Example 2.2Find the electric field a distance z above the midpoint of a straight line segment of length 2L that carries a uniform line charge lambda.But this time, I calculate the electric field using python and a numerical integrationHere is the python codetrinket.io/glowscript/e484648fc534Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Intro to Electrodynamics: Calculating the electric field due to a line segment Dot Physics 2025-08-22 | From Griffiths chapter 2. Example 2.2Find the electric field a distance z above the midpoint of a straight line segment of length 2L that carries a uniform line charge lambda.Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
Python Physics: 2 Right Ways and 1 Wrong Way to Make a Spherical Distribution Dot Physics 2025-08-21 | From Griffiths chapter 2How do you make a spherical distribution of charges? Here are three different methods.Python code:Cartesian grid trinket.io/glowscript/5ac6230d4009Spherical dist trinket.io/glowscript/b2154851cef1Random dist trinket.io/glowscript/976ce0490305Here is the playlist for the full courseyoutube.com/playlist?list=PLWFlMBumSLSYDQww1iwZXEyNJb6xnoxZL
