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a copper rod of mass m slides under grav...


a copper rod of mass m slides under gravity on two smooth parallel rails with separation I and set at an angle of `theta` with the horiziontal at the bottom rails are joined by resistance R. There is a uniform magnetic field B normal to the plane of the rails as shown in the figure The terminal speed of the copper rod is :

A

`(mg R cos theta)/(B^(2) I^(2))`

B

`(mg R tan theta)/(B^(2) I^(2))`

C

`(mg R cot theta)/(B^(2) I^(2))`

D

`(mg R sin theta)/(B^(2) I^(2))`

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