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A conducting rod with resistance r per u...

A conducting rod with resistance r per unit length is moving inside a vertical magnetic field B with speed v on two smooth horizontal parallel ideal conducting rails. The end of the rails are connected to a resistor R. the separation between the rails is d. The rod maintains a tilted angle `theta` to the rail. Find the external force F required to keep the rod moving

A

`F=(B^(2)d^(2)v)/(R+dr)`

B

`F=(B^(2)d^(2)v)/((R+dr//sin theta)`

C

`F=(B^(2)d^(2)vsin theta)/((R+dr)//sin theta)`

D

`F=(B^(2)d^(2)vcos theta)/((R+dr)//costheta)`

Text Solution

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The correct Answer is:
C
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