PhysVids: Physics videos by Cal Poly students

What does a battery do? (watch solution)

In this video, we look at the KE and V of an electron and compare the convenience of the two. (watch solution)

In Figure P29.45, a proton is fired with a speed of 200000 m/s from the midpoint of the capacitor toward the positive plate.
a) show that this is insufficient speed to reach the positive plate.
b) what is the proton's speed as it collides with the negative plate? (watch solution)

The electron gun in a TV picture tube accelerates electrons between two parallel plates 1.2 cm apart with a 25 kV potential difference between them. The electrons enter through a small hole in the negative plate, accelerate, then exit through a small hole in the positive plate. Assume that the holes are small enough not to affect the electric field or potential. (a) What is the electric field strength between the plates? (b) With what speed does an electron exit the electron gun if its entry speed is close to zero? (watch solution)

An electric dipole has dipole moment p. If r>>s, where s is the separation between the charges, show that the electric potential of the dipole can be written
V= (1/4piEo)(pcos0/r^2)
Where r is the distance from the center of the dipole and 0 is the angle from the dipole axis. (watch solution)

What is the electric potential energy of the group of charges? (watch solution)

The four 1.0 g spheres shown in FIGURE P29.41 are released simultaneously and allowed to move away from each other. What is the speed of each sphere when they are very far apart? (watch solution)

What is the speed of a proton that has been accelerated from rest through a potential difference of -1000V? (watch solution)

This video was about finding a proton's final velocity i that was released with an initial velocity at zero in an electric field. (watch solution)

A 2.0 cm x 2.0 cm parallel-plate capacitor has a 2.0 mm spacing. The electric Field strength inside the capacitor is 1,000,000 V/m. a) What is the potential difference across the capacitor? b) How much charge is on each plate? (watch solution)

Physics for Scientists and Engineers Second Edition(Knight) Chapter 29; #7: What is the electric potential energy of the group of charges in the figure? (watch solution)

What is a volt? (watch solution)

A 2.0 cm X 2.0 cm parallel-plate capacitor has a 2.0 mm spacing. The electric field strength inside the capacitor is 10 X 10^5 V/m.
a. What is the potential difference across the capacitor?
b. How much charge is on each plate? (watch solution)

A room with 3.0 m high ceilings has a metal plate on the floor with V= 0 V and a separate metal plate on the ceiling. A 1.0 g glass ball charged to 4.9 nC is shot straight up at 5.0 m/s. How high does the ball go if the ceiling voltage is (a) 3.0x10^6 V and (b) -3.0x10^6 V? (watch solution)

This is a tutorial of the equations u=qV and Kf qVf = Ki qVi (watch solution)

Why a voltmeter has two leads (watch solution)

What is the speed of an electron that has been accelerated from rest through a potential difference of 1000V? (watch solution)

A room with 3.0-m-high ceilings has a metal plate on the floor with V = 0V and a separate metal plate on the ceiling. A 1.0g glass ball charged to 4.9nC is shot straight up at 5.0m/s. How high does the ball go if the ceiling voltage is (a) 3.0 * 10^6 V and (b) -3.0 * 10^6 V? (watch solution)

Tutorial on Equation 29.21 and Equation 29.22 (watch solution)

A very brief description discussing the similarities in potential energy of a ball sitting on the surface of the earth and a positively charged particle sitting on an infinitely large negatively charged plate. Compares the idea of the E field * charge relationship to a physical model of mass * acceleration. (watch solution)