ElectroMagnetic InductionHard
Question
A constant force F is being applied on a rod of length ′l′ kept at rest on two parallel conducting rails connected at ends by resistance R in uniform magnetic field B as shown.
Options
A.the power delivered by force will be constant with time
B.the power delivered by force will be increasing first and then it will decrease
C.the rate of power delivered by the external force will be increasing continuously
D.the rate of power delivered by external force will be decreasing continuously before becoming zero.
Solution
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.
= F × a. Thus, rate of power delivered by external force will be decreasing continuously.Create a free account to view solution
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