One conducting 17-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 speed v, then the emf induced in the circuit in terms of B, 1 and v, where 1 is the width of each tube, will be [AIEEE 2005] |
A) \[BIl\]
B) \[-BIl\]
C) zero
D) \[2\,BIl\]
Correct Answer: D
Solution :
[d] Relative velocity of tubes with respct to each other |
Now, emf induced in circuit made by two tubes is |
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