Question

The phase difference b/w the A.C. and e.m.f. is π/2. Which of the following cannot be the instituent of the circuit?
1. LC
2. L alone
3. C alone
4. None of these

Answer 1

Correct Answer - Option 4 : None of these

CONCEPT:

Resistor: 

• It is an electrical component that has two terminals and it is used for either limiting or regulating the flow of electric current in electrical circuits.

Inductor: 

• Inductors are coil-like structures that are used in electrical circuits.
  1. The coil is an insulated wire with a central core. 
  2. An inductor is used to store energy in the form of magnetic energy when ac electricity is applied to the circuit.
  3. One of the main properties of an inductor is that it opposes the change in the amount of current flowing through it.

EXPLANATION:

• We know that when the inductor (L) has connected alone in the circuit, the phase difference between the A.C. and e.m.f. is π/2.
• We know that when the capacitor (C) is connected alone in the circuit, the phase difference between the A.C. and e.m.f. is π/2.
• We know that the phase of L and C are 180° out of each other. So in the LC series circuit, the net effect will be due to the stronger of L or C, and the resultant phase difference between the A.C. and e.m.f. will be π/2.
• So LC, L alone, and C alone are possible when the phase difference is π/2.
• Hence, option 4 is correct.