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Question

A particle with a specific charge s is fired with a speed v towards a wall at a distance d, perpendicular to the wall. What minimum magnetic field must exist in this region for the particle not to hit the wall?

A
vsd
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B
2vsd
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C
v2sd
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D
v4sd
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Solution

The correct option is A vsd
The particle moves in a circle of radius d if it will just miss the wall.

mv2r=qvB

mv=qBr

B=vqmr=vsd

186654_166118_ans.JPG

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