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Question

- B=mvqd and Δt=πdv
- B=mv2qd and Δt=πd2v
- B=2mvqd and Δt=πd2v
- B=2mvqd and Δt=πdv

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Solution

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qvB=mv2r where r=d/2

Therefore,

B=2mvqd

Total displacement is d when charge travels for time, δt

Therefore,

Therefore,

δt=πd2v

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