Question

A circular coil of wire 10cm in diameter has 18 turns and carries a current of 8A. The coil is inserted into a field of magnetic induction 1.2T (a) what is the maximum torque on the coil? (b) what is the dipole moment of the coil?

Answer 1

Answer

b) Magnetic moment

$M=NiA\\=18\times8\times3.14\times0.0025\\=1.13A-m^2$

a) Maximum torque

$\tau=MB=1.13\times1.2$

=1.36A-m² -T