In Fig. what should be the speed of the charged particle so that it cannot collide with the upper wall? Also, find the coordinates of the point where the particle strikes the lower plate in the limiting case of velocity.

Explanation

The path of the particle will be
circular, larger the velocity, larger
will be the radius.
For particle not to strike, `R lt d`
`:. (mv)/(qB)ltd implies vlt(qBd)/m`
For limiting case, `v=(qBd)/m, R=d`
`:.` Coordinate where the particle strikes `=(-2d,0,0)`

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