MHTCET 16 Apr 2026 Shift 1 Paper

Concept:Torque on a current-carrying coil depends on its magnetic dipole moment and the external magnetic field.Explanation:The magnetic dipole moment of a coil is given by:$$\vec{m} = n I \vec{A}$$The torque acting on the coil in a magnetic field is:$$\vec{\tau} = \vec{m} \times \vec{B}$$Substituting $\vec{m}$, we get:$$\vec{\tau} = n I (\vec{A} \times \vec{B})$$This vector form holds for any orientation of the coil relative to the magnetic field. Therefore, the correct expression is:$$\vec{\tau} = n I (\vec{A} \times \vec{B})$$Answer:Option B: $n I (\vec{A} \times \vec{B})$