Name: _Midterm 1 From A_ Date: _Feb 22, 2016_
1. A 5.0-C charge is 10 m from a 2.0-C charge. The electrostatic force is on the positive
charge is:
A) 9.0 108 N toward the negative charge
B) 9.0 108 N away from the negative charge
C) 9.0 109 N toward the n

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Homework 1
Chapter 21
6. (a) With a understood to mean the magnitude of acceleration, Newtons second and third laws lead
to m1a1 = m2a2 so m2 = (6.3 x 10-7 kg)(7.0 m/s2)/(9.0 m/s2) = 4.9 x 10-7 m/s2
(b) The magnitude of the (only) force on particle 1 is
2

Homework 2
Chapter 22
26. Studying Sample Problem 22.03 Electric field of a charged circular rod, we see that the field
evaluated at the center of curvature due to a charged distribution on a circular arc is given by
E
sin
4 0r
along the symmetry axis, w

Homework 6
Chapter 28
8) Letting , F = q( E + vxB) = 0, we get vB sin E . We note that (for given values of the fields) this gives
a minimum value for speed whenever the sin factor is at its maximum value (which is 1, corresponding
to = 90). So
vmin
E 1.

Homework 3 Solutions
Chapter 23
30. We reason that point P (the point on the x axis where the net electric field is zero) cannot be
between the lines of charge (since their charges have opposite sign). We reason further that P is not to
the left of line 1

Homework 5 Solutions
Ch 26
Questions 4
Problems 42
Ch 27
Questions 12
Problems 8, 30, 50, 58, 72
Ch26
Q4) a,b and c all tie, then d (zero)
42. (a) Referring to Fig. 26-33, the electric field would point down (toward the bottom of the
page) in the strip, w

Homework 4 Solutions:
Ch 25 Question: 4,8
Problems: 6, 14, 34, 44
Ch 26
Problems: 8, 18
Ch 25
Q4) a)2; b)3; c)1
Q8) a)V/3; b)CV/3; c) CV/3
6. (a) We use C = A0/d. The distance between the plates is
2
12
2
2
A 0 1.00m 8.85 10 C /N m
d
8.851012 m.
C
1.00F

Examples from Chapter 28-29
Example 28-49
Given:
Current, i = 0.1A
B = 0.5T
= 30
Sides are 5cm and
10 cm
What is net
torque about the
hinge line?
i = 0.1A
B = 0.5T
= 30
Example 28-49
What is net torque about the
hinge line?
= r x F
L
F
L
i = 0.1A
B = 0.

Name: _Midterm 3 Form A_ Date: _4/25/2016_
1. The total energy in an LC circuit is 5.0 106 J. If C = 15 F the maximum charge on
the capacitor is:
A) 8.5 C
B) 17 C
C) 24 C
D) 12 C
E) 0.82 C
2. In an ideal 1:8 step-down transformer, the primary power is 10

Name: _final form A_ Date: _5/13/2016_
1. A particle with a charge of 5 106 C and a mass of 20 g moves uniformly with a speed
of 7 m/s in a circular orbit around a stationary particle with a charge of 5 106 C. The
radius of the orbit is:
A) 1.6 m
B) 0.62

Name: _midterm 2 form A_ Date: _3/28/2016_
1. Five cylindrical wires are made of the same material. Their lengths and radii are
wire 1: length , radius r
wire 2: length 3/2, radius r/2
wire 3: length /2, radius r/2
wire 4: length , radius r/2
wire 5: leng