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Q.

A charged particle of mass m and charge q enters along AB at point A in a uniform magnetic field existing in the rectangular region of size a  ×   b. The particle leaves the region exactly at corner point C. What is the speed v of the particle ?

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a

qBa2-b22ma

b

qBa2-b22mb

c

qBa2+b22mb

d

qBa2+b22ma

answer is A.

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Detailed Solution

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Let speed of the particle be v (speed will remain constant).

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r=AO=CO=mvqB;   Also  ar  =  sinθ,  rbr=cosθ

Solving the above equations, we get v=qBa2+b22mb

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