Physics-
General
Easy
Question
One conducting U tube can slide inside another as shown in figure, maintaining electrical contacts between the tubes. The magnetic field B is perpendicular to the plane of the figure. If each tube moves towards the other at a constant sped v then the emf induced in the circuit in terms of B, l and v where l is the width of each tube, will be
- Zero
The correct answer is:
Two emf's induces in the closed circuit each of value . These two emf's are additive. So 
.
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