Exam 2
Exam: exam2.doc

Averages:

Q1
Q2
Q3
Q4
Q5
P1
P2
Total
6.4
7.1
7.5
4.4
6.7
6.3
12.0
50.5

Solutions:

Question 1

q1.PDF

Question 2

The potential - in both cases - is:

and the field in the center is zero (by symmetry) for part (a) and non-zero for (b)

 

Question 3

wRank: c > d >a = b is the answer. Note that in (a) and (b) the fields all cancel. In (c) none of the fields cancel and (d) the diametrically opposed currents out of the paper cancel but not the other two.

Question 4

 

Let's write the E field as:

 

Applying the modified Ampere's law:

Calling the radius R:

In front of the capacitor in the picure above the B field points from right to left.

Question 5

Problem 1

p1.PDF

Problem 2

p2.PDF