As shown in the figure a metal rod makes contact and complete the circuit. The circuit is perpendicular to the magnetic field with 
tesla. If the resistance is 
, force needed to move the rod as indicated with a constant speed of 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Induced current in the circuit 
Magnetic force acting on the wire 
External force needed to move the rod with constant velocity
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