Physics - Magnetism Question with Solution | TestHub

The magnetic dipole moment of a coil of $n$ turns, area $\vec{A}$, and carrying current $I$ is given by $\vec{M}=nI\vec{A}$.

The torque $\vec{\tau }$ acting on a magnetic dipole placed in a uniform magnetic field $\vec{B}$ is given by $\vec{\tau }=\vec{M}\times \vec{B}$.

Substituting the value of $\vec{M}$, we get $\vec{\tau }=nI(\vec{A}\times \vec{B})$.

Answer: $nI(\vec{A}\times \vec{B})$