A circular loop of area $1$ $c{m}^2$, carrying a current of $10$A, is placed in a magnetic field of $0.1$T perpendicular to the plane of the loop. The torque on the loop due to the magnetic field is?

A current carrying loop of radius $2cm$ has $4A$ current flowing in an anti-clockwise direction. The plane of the loop makes an angle of $\theta$ with the direction of the magnetic field which is in an upward direction. the value of the magnetic field is $0.7Tesla$.if potential energy of loop in magnetic field is $\approx 0.01J$, then value of $\theta$ is: