In the same model of the above question if the cart is to be moved with constant velocity v ,then the power supplied by external agent applying that forceb is
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The force needed to keep the velocity constant
Fext=ilB=B2l2vR+r
Power due to external force =B2l2v2R+r=ε2R+r=i2(R+r)
Note that the power delivered by the external agent is converted into joule heating in the circuit.That means magnetic field helps in converting the mechanical energy into joule heating.
Explanation:
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