A bar magnet is dropped from above and falls through the loop of ...

[HCHenry]

A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of the bar magnet points downward towards the page as it falls. Which statement is correct?
 
   

   
  a.
  The current in the loop always flows in a clockwise direction.
   
  b.
  The current in the loop always flows in a counterclockwise direction.
   
  c.
  The current in the loop flows first in a clockwise, then in a counterclockwise direction.
   
  d.
  The current in the loop flows first in a counterclockwise, then in a clockwise direction.
   
  e.
  No current flows in the loop because both ends of the magnet move through the loop.

Question 2

A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, V_A  V_P?
 
   

   
  a.
  12 mV
   
  b.
  +8.0 mV
   
  c.
  8.0 mV
   
  d.
  +12 mV
   
  e.
  16 mV

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Answer to Question 1

d

Answer to Question 2

c

[HCHenry]

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