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 speed 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
A
zero
B
C
Blv
D
- Blv
Text Solution
Verified by ExpertsThe correct answer is:
B
Two emfs are induced in the closed circuit each of value Blv. These two emfs are additive, so 
.
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