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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