JEE Mains Model Paper 6

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Question : 54 of 90
 
Marks: +1, -0
Aconducting rod of length l and mass m is moving down a smooth inclined plane of inclination q withconstant velocity v. A current i is flowing in the conductor in a direction perpendicular to paper inwards.A vertically upward magnetic field
→
B
exists in space. Then magnitude of the magnetic field
→
B
is
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