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Question

A horizontal straight conductor of mass m and length l is placed in a uniform vertical magnetic field of magnitude B. An amount of charge Q passes through the rod in a very short time such that the conductor 
begins to move only after all the charge has passed through it . Its initial velocity will be


Your Answer
A
BQlm
Your Answer
B
BQlm
Correct Answer
C
BQlm
Your Answer
D
BlmQ

Solution

The correct option is A BQlm
The ampere force on the conductor is F = Bil. The impulse given by this force to the conductor is J=Fdt=Blidt=BlQ=mv

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