Assertion (A) It is more difficult to move a magnet into a coil with more loops.

Reason (R) This is because emf induced in each current loop resists the motion of the magnet.

Two inductors A and B when connected in parallel are equivalent to a single inductor of inductance 1.5 H and when connected in series are equivalent to a single inductor of inductance 8H. Find the difference in the inductances of A and B.

A resonant frequency of a current is $$f$$. If the capacitance is made four times the initial value, then the resonant frequency will become

The law which states that a variation in an electric field causes magnetic field, is