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Question

A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is


A
2πqnr×107 Newton/(amperemetre)
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B

2πqr×107 Newton/(amperemetre)

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C

2πnqr×107 Newton/(amperemetre)

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D

2πqr×107 Newton/(amperemetre)

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