A loop PQRS is moving θ in a magnetic field with uniform speed as shown in figure, then comment regarding the induced emf (e).
A
eRS=1
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B
ePS+eQP=eRS
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C
eQR<eQP
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D
ePS+eQP=eQR and ePQRSP=0
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Solution
The correct option is DePS+eQP=eQR and ePQRSP=0
eRS=0 since the length is along the velocity of the rod. ePS+eQP=eQS but not eRS eQR>eQP Since eRS=0, ePS+eQP=eQR The flux in the entire loop is constant, so the induced EMF is zero.