Two circular coils P & Q are coaxially & carry currents `I_1` and `I_2` respectively (all direction are w.r.t. the observer)

Two concentric circular coils of radii R and r (lt lt R) carry currents of i_(1) and i_(2) respectively. If the smaller coil is rotated slightly about one of its diameter, it starts oscillating. Then, which of the following statement(s) is//are correct ?

Two concentric circular coils of radii R and r (lt lt R) carry currents of i_(1) and i_(2) respectively. If the smaller coil is rotated slightly about one of its diameter, it starts oscillating. Then, which of the following statement(s) is//are correct ?

Two coaxial circular loops of raadii r_(1) and r_(2) are separated by a distance x and carry currents i_(1) and i_(2) respectively. Calculate the mutual inductance. What is the force between the loops ?

Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?

Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?

Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?