List of top Physics Questions on torque asked in AIIMS

A closely wound solenoid of $2000$ turns and area of cross-section $1.5 \times 10^{-4} m ^{2}$ carries a current of $2.0 A$. It is suspended through its center and perpendicular to its length, allowing it to turn in a horizontal plane in a uniform magnetic field $5 \times 10^{-2} T$, making an angle of $30^{\circ}$ with the axis of the solenoid. The torque on the solenoid will be

A particle of mass $m$ moves in the $XY$ plane with a velocity ' $v$ ' along the straight line $A B$. If the angular momentum of the particle with respect to origin $O$ is $L _{ A }$ when it is at $A$ and $L_{B}$ when it is at $B$, then