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A block of mass m & charge q is released...

A block of mass m & charge q is released on a long smooth inclined plane magnetic field `B` is constant, unifrom, horizontal and parallel to surface a shown Find the time from start when block loses contact with the surface
.

A

`(m cos theta)/(qB)`

B

`(m cos theta)/(qB)`

C

`(m cot theta)/(qB)`

D

None

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