A conducting bar of length L rotates in a counterclockwise ...

[karen]

A conducting bar of length L rotates in a counterclockwise direction 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_B?
 
   

   
  a.
  +24 mV
   
  b.
  24 mV
   
  c.
  +16 mV
   
  d.
  16 mV
   
  e.
  +32 mV

Question 2

A bar (L = 80 cm) moves on two frictionless rails, as shown, in a region where the magnetic field is uniform (B = 0.30 T) and into the paper. If v = 50 cm/s and R = 60 m, what is the magnetic force on the moving bar?
 
   

   
  a.
  0.48 N to the right
   
  b.
  0.48 N to the left
   
  c.
  0.32 N to the left
   
  d.
  0.32 N to the right
   
  e.
  None of the above

[dmurph1496]

Answer to Question 1

a

Answer to Question 2

b