Physics

Problem

Which one of the following expressions represents the magnitude of the magnetic field at the centre of a circular coil of radius

R

, carrying current

I

and having

n

closely wound turns? a)

B = \dfrac{\mu_0 n I}{2\pi R}

B = \dfrac{\mu_0 I}{2\pi R}

B = \dfrac{\mu_0 n I}{2R}

B = \dfrac{\mu_0 n^{2} I}{2R}