Electromagnetic Induction

JEE Main level, single correct, medium

65 of 153

Question 65 of 153

One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field BB is perpendicular to the plane of the figure. if each tube moves towards the other at a constant speed V, then the emf induced in the circuit in terms of B,ℓB, \ell and V\mathrm{V} where ℓ\ell is the width of each tube will be

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Answer: (D) 2BℓV2 \mathrm{B}\ell \mathrm{V}

∣dϕdt∣=2Bℓv\left|\frac{d \phi}{d t}\right|=2 B \ell v

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