A constant force F is being applied on a rod of length 
kept at rest on two parallel conducting rails connected at ends by resistance R in uniform magnetic field B as shown.
Text Solution
Verified by ExpertsThe correct answer is:
D
Force acting on the rod because of the induced current due to change in magnetic flux will try to oppose the motion of rod. Hence the acceleration of the rod will decrease with time 
= F × a. Thus, rate of power delivered by external force will be decreasing continuously.
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