Sample Exam 3 Answers

1.    Clockwise    2.    B=4.56E-7 T     3.    Rate of Change of B=2.0 T/s

4.    R(galv)=100Ohms

5.    a

6.    a)     B(center)=0
b)    F/length=1.00E-7 N/m  repel

c)

Case a at the center the fields add up to zero.

Case b at the center the contribution to the total field from each current is equal.   

d)    B(center)=4.00E-7T toward top of the page as drawn for case b above.

7.   a)    Rate of change of current=10000 A/s
b)    I=100A
c)    Energy=5.00J

8.    a)    emf=0.314Volts
b)    I induced is clockwise.
c)    I induced=0.314A
d)    Into the page

9.    a)  Draw resistor in series with the galvanometer.
    b)    R=2.0E5 Ohms
c)    Draw the resistor in parallel with the galvanometer.
d)    R=2.00E-4 Ohms