Torque acting on a coil carrying current 'I' situated parallel to magnetic field of induction 'B' having of turns 'n' and area 'A' is

A metal rod of length 'L' completes the circuit as shown. The area of the circuit is perpendicular to magnetic field 'B'. Total resistance of the circuit is 'R'. The force needed to move the rod in the direction as shown with constant speed 'V' is

When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit

With gradual increase in frequency of an a.c. supply, the impedance of an LCR series circuit