A rod (length = 10 cm) moves on two horizontal frictionless ...

[EAugust]

A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12- load resistor?
 
   

   
  a.
  0.32 A
   
  b.
  0.34 A
   
  c.
  0.37 A
   
  d.
  0.39 A
   
  e.
  0.43 A

Question 2

In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0- resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L = 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s?
 
   

   
  a.
  8.6 W
   
  b.
  7.8 W
   
  c.
  7.1 W
   
  d.
  9.3 W
   
  e.
  1.8 W

[diana chang]

Answer to Question 1

a

Answer to Question 2

c

[EAugust]

Excellent

[xiazhe]

Gracias!