In a hypothetical system a particle of mass m and charge - 3q is moving around a very heavy particle having charge q. Assuming Bohr's model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is
A
3q22ϵ0h
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B
3q24ϵ0h
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C
3q2ϵ0h
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D
3q4ϵ0h
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Solution
The correct option is A3q22ϵ0h 14πϵ0q×3qr2=mv2r...(1) and mvr=h2π...(2) From (1) and (2), we get v=3q22hϵ0