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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 costheta)/(qB)`

B

`(mcosectheta)/(qB)`

C

`(mcottheta)/(qB)`

D

none

Text Solution

Verified by Experts

The correct Answer is:
C
Block will loses confact when force due to magnetic field will become equal to mag costheta
`qVB = mg cos theta`
`V = (mg costheta)/(qB) = g sinthetat = (m cottheta)/(qB)` .
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