Question

Write the formula for torque acting on rotating current carrying coil in terms of magnetic dipole moment, in vector form.

Answer 1

The formula for torque acting on the rotating current-carrying coil is:

τ = N I A B sin θ

τ = M B sin θ

In vector Form,

`vectau = vec M xx vec B`

where,

N = Number of turns,

I = Current in the coil,

A = Area of cross - section of coil,

B = Magnetic field.

M = Magnetic dipole moment.