12P02 Electric Potential and Capacitance

Understand how much distance I have to move to cause a voltage difference of 1 V 

a) Far away from the source charge b) Very close to the source charge. 

Connect that finding with Conservative Force / Field concepts

$E= - \frac{dV}{dr} \; \;  F = -\frac{dU}{dr}$

Equipotential Lines for two charges separated by a distance 

a) oppositely charged b) same charged

 

Why E perpendicular to surace

Electric potential Playlist 

Capacitor Basics

What is a capacitor? What is that 80V in the Label? What is the resistor doing here?

Capacitor Basics

Change the battery voltage and see what happens to 

the charge and the voltage in the capacitor, Q = C V

Change the area and gap between the plates and see what happens 

to the Capacitance value, C = epsilon_o A / d

Capacitors in Series and Parallel and combination of both.

For Series connection Charge Q is same in both capacitors,

V = V1 + V2

Q/C = Q/C1 + Q/C2

1/C = 1/C1 + 1/C2

Double check the voltage and charge calculations with simulation results.

For Parallel connection Voltage V is same in both capacitors,

Q = Q1 + Q2

C V = C1 V + C2 V

C = C1 + C2

Double check the voltage and charge calculations with simulation results.

Introduction of Dielectric, Battery Disconnected

As Dielectric is introduced, see what happens to the 

Voltage, Electric Field, Charge, Capacitance, Energy.

Introduction of Dielectric, Battery Connected

As Dielectric is introduced, see what happens to the 

Voltage, Electric Field, Charge, Capacitance, Energy.

Redistribution of Charges in Capacitors

Charged capacitor becomes an Open Circuit (in steady state)

Voltage Divider Formula in Capacitors 

Capacitor plates pulled apart.

1) Battery Disconnected 2)Battery Connected

What happens to the Charge Q, Voltage V, Electric Field E, Capacitance C and Energy U?