A charge q coulomb makes n revolutions in one second in a circular orbit of radius r. The magnetic field at the centre of the orbit in NA−1m−1 is
A
2πrnq×10−7
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B
(2πrnq)×10−7
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C
(2πqnr)×10−7
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D
(2πnqr)×10−7
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Solution
The correct option is D(2πnqr)×10−7 Magnetic field at the centre of the circular orbit is given by B=(μ0I2r) B=(2μ0I4rπ)×π We get B=2μ0Iπ4πr Thus B=2πIr×10−7[∵μ04π=10−7] ⟹B=(2πnqr)×10−7[∵I=nq]