Q6.A circular coil with a
cross-sectional area of 4 cm2 has 10 turns. It is placed at the
centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10
cm2. The axis of the coil coincides with the axis of the solenoid.
What is their mutual inductance?
Q9.In an electrical circuit, R,
L, C and AC voltage source are all connected in series. When L is
removed from the circuit, the phase difference between the voltage and current
in the circuit is π /3 . Instead, if C is removed from the circuit,
the phase difference is again π / 3 . The power factor of the circuit is