Physics 4B 12/2/2020
EXAM 2
March 18, 2004
Name:____________________
Rules for Exam:
1. Calculators are allowed, but you may not share one.
2. Show your work on non-multiple choice problems. NO WORK=NO CREDIT.
3. Include units with each answer. One point deduction per infraction.
4. Points will be deducted for students that refuse to turn in their exams, when asked to do so (at
the end of class).
5. Round off to 2 decimal places and circle your final answers.
6. Circle your final answers.
Good Luck!
Equations, Conversion Factors and Constants:
Chapter 26
Eplates vacuum=/
C=q/V
Ceq=C1+C2+..
1/ Ceq=1/ C1+ 1/C2+…
U=1/2CV2
U=1/2E2
=k
C=A/d
=pxEpxE
U=-pE
Chapter 27
I=dQ/dt
J=I/A=nqvd
J=pxEE=pxEE/
R=L/A=V/I
vd=pxE(q/m)E
=me/(nq2)
[1+(T-To)]
P=IV=V2/R
Chapter 28
Req=R1+R2+..
1/Req=1/ R1+ 1/R2+…
q(t)=Qmax(1-e-t/RC)
I(t)=Ioe-t/RC
q(t)=Qmaxe-t/RC discharge
q(t)=-(Qmax/RC)e-t/RC discharge
Scores
Part 1 (24 pts)
Problem 1 (16 pts)
Problem 2 (15 pts)
Problem 3 (15 pts)
Problem 4 (15 pts)
Problem 5 (15 pts)
Problem 6 (20 pts)
TOTAL (120 max)
% (out of 115)
1
€
k= 8.99x10
9
Nm
2
C
2
ε
o
= 8.85x10
−12
C
2
Nm
2
q
e
= 1.602x10
−19
C
m
e
= 9.11x10
−31
kg
m
p
= 1.67x10
−27
kg
1μC = 10
−6
C= 10
3
nC = 10
6
pC
1μA = 10
−6
A= 10
−3
mA
