Which one of the following expressions gives the magnitude of the magnetic field at…

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

Problem

Which one of the following expressions gives the magnitude of the magnetic field at the centre of a single circular loop of radius

R

carrying a steady current

I

in free space? (a)

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

(b)

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

(c)

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

(d)

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