1.

A conducting rod with resistance r per unit length is moving inside a vertical magnetic field B with spee 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

Answer»

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

ANSWER :C


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