A square loop of side carries a current

PHYSICS · Single correct · AP · Physics C: Electricity and Magnetism · Magnetic Fields and Electromagnetism · Magnetic Fields and Electromagnetism

Problem

A square loop of side

a

carries a current

I

. The magnetic field at the centre of the loop is (1)

\frac{2\mu_0I\sqrt{2}}{\pi a}

(2)

\frac{\mu_0I\sqrt{2}}{\pi a}

(3)

\frac{4\mu_0I\sqrt{2}}{\pi a}

(4)

\frac{\mu_0I}{\pi a}