Physics - Magnetism Question with Solution | TestHub

Statement-1 is false. A current-carrying loop in a uniform magnetic field experiences a net force of zero. However, if the magnetic field is non-uniform, the loop can experience a non-zero net force.

Statement-2 is false. The torque on a current loop in a uniform magnetic field is given by $\vec{\tau }=\vec{M}\times \vec{B}$, where $\vec{M}$ is the magnetic dipole moment. The magnitude of the torque is $\tau =MB\sin \theta$, where $\theta$ is the angle between $\vec{M}$ and $\vec{B}$. The plane of the loop is perpendicular to $\vec{B}$ means $\vec{M}$ is parallel to $\vec{B}$ (i.e., $\theta =0^{\circ }$), which results in zero torque ($\sin 0^{\circ }=0$). Torque is maximum when the plane of the loop is parallel to the magnetic field, meaning $\vec{M}$ is perpendicular to $\vec{B}$ (i.e., $\theta =90^{\circ }$).