Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Force Acting on Moving Charges

A charge q coulomb moves in a circle with n revolutions per second and the radius of the circle is r metre. The magnetic field at the centre of the circle is :
\[\frac{2\pi q}{nr}\times10^{-7}NA^{-1}m^{-1}\]
\[\frac{2\pi q}{r}\times10^{-7}NA^{-1}m^{-1}\]
\[\frac{2\pi nq}{r}\times10^{-7}NA^{-1}m^{-1}\]
\[\frac{2\pi q}{r}\times NA^{-1}m^{-1}\]

No solution provided for this question.

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