Name the logic gates marked P and Q in the given logic circuit.

The power factor of an a.c. circuit is 0.5. What is the phase difference between voltage and current in the circuit?

In which situation is there a displacement current but no conduction current?

Define the term relaxation time in a conductor.

What is electrostatic shielding? How is this property used in actual practice? Is the potential in the cavity of a charged conductor zero?