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In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is:

In the circuit shown, if R = 0, then the phase angle between v(t) and i(t) is: Correct Answer 90°

  • If R = 0, the given circuit will become pure inductive circuit.
  • The circuit which contains only inductance (L) and not any other quantities like resistance and capacitance in the circuit is called a pure inductive circuit. 
  • In this type of circuit, the current lags behind the voltage by an angle of 90 degrees.
  • So, the phase angle between v(t) and i(t) in the given circuit is 90°.

 

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Important Points:

  • In a pure resistive circuit, the current is in phase with voltage and the power factor is unity.
  • In a pure inductive circuit, the current lags the voltage by 90° and the power factor is zero lagging.
  • In a pure capacitive circuit, the current leads the voltage by 90° and the power factor is zero leading.

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