Question

A circular coil of radius 4cm and 20 turns carries 3 ampere current.find the magnetic moment of coil

Answer 1

Answer:

Given that radius(r)=4cm=0.04m

Number of turns, n=20

Current in the coil, i=3A

We know that, area of a circular coil, A=πr2

Therefore area of our current carrying coil, A=π×(0.04)2=0.00502m2≃0.0050m2(approximating)

We also know that magnetic dipole moment, M=niA=20×3×0.0050=0.3A−m2