1.

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.            \[\frac{2\pi q}{nr}\times {{10}^{-7}}\] N/amp/metre
B.            \[\frac{2\pi q}{r}\times {{10}^{-7}}\] N/amp/metre
C.            \[\frac{2\pi nq}{r}\times {{10}^{-7}}\]N/amp/metre
D.            \[\frac{2\pi q}{r}\] N/amp/metre
Answer» D.            \[\frac{2\pi q}{r}\] N/amp/metre


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