A block of mass $m$ $\&$ charge $q$ is released on a long smooth inclined plane magnetic field $B$ is constant, uniform, horizontal and parallel to surface as shown. Find the time from start when block loses contact with the surface.
A block of mass $m$ $\&$ charge $q$ is released on a long smooth inclined plane magnetic field $B$ is constant, uniform, horizontal and parallel to surface as shown. Find the time from start when block loses contact with the surface.
- A
$\frac{{m\,\cos \,\theta }}{{qB}}$
- B
$\frac{{m\,\cos ec\,\theta }}{{qB}}$
- C
$\frac{{m\,\cot \,\theta }}{{qB}}$
- D
none
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