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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 to not to hit the wall?

A
vsd
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B
2vsd
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C
v2sd
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D
v4s
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Solution

The correct option is A vsd
Let us try to understand this problem with the help of this diagram

Let r be the radius of this circular path.
So, rd
We know that r=mvqB
mvqBd
s (specific charge) =qm
So, vsBd
vsdB
Thus, the minimum value of B=vsd

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