Physics

Problem

The dipole moment of a circular loop carrying a current

I

, is

m

and the magnetic field at the centre of the loop is

B_1

. When the dipole moment is doubled by keeping the current constant, the magnetic field at the centre of the loop is

B_2

. The ratio

\frac{B_1}{B_2}

is: a.

2

\sqrt{3}

\sqrt{2}

\frac{1}{\sqrt{2}}