A rectangular loop of wire of size $2 \mathrm{cm}\times 5 \mathrm{cm}$ carries a steady current of $1 A$. A straight long wire carrying $4 A$ current is kept near the loop as shown in Figure. If the loop and the wire are coplanar, find (i) the torque acting on the loop and (ii) the magnitude and direction of the force on the loop due to the current carrying wire.

A square loop of side $20 \mathrm{cm}$ carrying current of $1 A$ is kept near an infinite long straight wire carrying a current of $2 A$ in the same plane as shown in Figure. Calculate the magnitude and direction of the net force exerted on the loop due to the current carrying conductor.

A rectangular coil $PQRS$ is placed in a uniform magnetic field $\overrightarrow{B}$, as shown in Figure. Find the torque on the coil when it carries a current of $2.0 A$. The magnitude of the field $\overrightarrow{B}$ is $2.0\times {10}^{-2} T$.