Equations and Signs
Equation for electric potential (not specific to capacitor)
V = kQ/r (Q = STATIONARY)
What is a capacitor?
a device that stores charge
Extra Problem 2
-0.77 J
equation for PE
PE = qV (q = charge that is FREE TO MOVE)
What happens to electrical force and acceleration on a particle when charge is increased?
Extra Problem 4
1.3 x 10^3 m/s
Equation for Delta PE
Delta PE = q DeltaV (q = charge that is FREE TO MOVE)
Difference between V and PE
Units, Electrical potential (V) is potential energy per unit of charge
Extra Problem 9
1.8 x 10^7 m/s
V = Q/C (Q = charge on capacitor, STATIONARY)
Potential has the sign of which charge?
stationary
Extra Problem 6
2.2 m
Units of electrical potential and potential energy
V, J
A + particle is placed near a stationary charge. If potential energy is positive, is the stationary charge + or -?
+
Extra Problem 7
3.5 m