A particle of charge −q and mass m moves in a circle of radius r around an infinitely long line charge of linear charge density +λ. The speed of particle is
A
√2kλqm
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B
√5kλqm
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C
√kλqm
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D
√3kλqm
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Solution
The correct option is A√2kλqm Let v be the speed of particle moving in the circle.
Here, the electric force (Fe) acting on charge −q due to infinite line charge will act as the required centripetal force.