Quiz 3, Version 3: Physics 1B Spring 2012, Dr. Michelsen. You may not bring in anything written. You
will be given these formulas on Quiz 3:
G  6.67  1011 N-m 2 kg 2
g  9.8 m/s 2
ke  8.99  109 N-m 2 C2
proton charge  1.6  1019 C
surface area of a sphere  4 r 2
4
volume of a sphere   r 3
3
x f  xi  vi t  at 2 / 2
Fe  ke
E  ke
q
 ri 2i rˆi
q1q2
r2
electron mass  9.11  10 31 kg
U

Q
 E  E A  4 ke qin 
B
A
V (r )  k e
E  dr
Rtot  R1  R2
1
1
1


Rtot R1 R2
P   V  I
V  IR
q
r
1
4 0
E  Fe / q0
rˆ12
i
V 
ke 
C
qin
0
Q 0 A

d
V
Ctot  C1  C2
1
1 Q2
2
U  C  V  
2
2 C
1
1
1


Ctot C1 C2
You are expected to know Kirchoff’s laws, since they follow from simple conservation principles, and the
definition of current.
For this quiz, you do not need to know I  nqvd A , but it may appear on a future quiz.