Units
Units of Energy
Joules
formula for V and PE
V = kq/r, PE = qv
What is a capacitor
Device that stores charge
Problem 2
-0.77 J
Units of Charge
Coulombs
A positive particle is placed near stationary charge. If electric potential is positive, is stationary charge positive or negative?
positive
Negative charge is shot between + and negative places of a capacitor, draw its path. What controls how much it bends?
amount of charge
Extra practice problem 4
1.3 x 10^3 m/sec
Units of potential, v, delta v
volts
A freely moving particle is placed near a stationary negative charge. If the freely-moving particle's potential energy is negative, is its charge positive or negative?
positive (V = k q / r where q is stationery, PE = qv where q is moving particle)
Extra practice problem 8
1.01 x 10^8 F
Extra practice problem 5
7.9 x 10^5 m/s
Units of capacitance, C
farads
A negative charge moves towards a negative charge. As the two charges get closer, does potential energy increase or decrease?
extra practice problem 9
1.8 x 10^7 m/sec
Extra practice problem 6
2.2 m
units of k
N m^2/C^2
When charge moves from negative potential to positive potential, is the change in potential + or negative
+
Extra practice problem 10
5.0 x 10^5 C
Extra practice problem 7
3.5 m