Which of the following expressions correctly gives the magnitude of the magnetic…

PHYSICS · Single correct · CBSE · Physics · Moving Charges and Magnetism · Moving Charges and Magnetism

Problem

Which of the following expressions correctly gives the magnitude of the magnetic field

B

at the centre of a single circular loop of radius

R

carrying current

I

? (

\mu_0

is the permeability of free space.) (a)

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

(b)

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

(c)

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

(d)

B = \dfrac{\mu_0 I}{4\pi R}