The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit ?

Question

The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit ? (A) C alone (B) R, L (C) L, C (D) L alone

Tardigrade Admin · Accepted Answer

If the phase difference between V and I is (π/2) ∴ Power = V ⋅ I = V I cos (π/ 2 )= 0 Since Power is 0 it should only consists of reactive elements (L C), Resistance R cannot be present.

Q. The phase difference between the alternating current and emf is $π /2$ . Which of the following cannot be the constituent of the circuit ?

$C$ alone

$R, L$

$L, C$

$L$ alone

If the phase difference between
$V$ and $I$ is $\frac{π}{2}$
$∴$ Power $= V \cdot I = V I cos \frac{π}{2} = 0$
Since Power is 0 it should only consists of reactive elements (L & C), Resistance R cannot be present.

Q. The phase difference between the alternating current and emf is π/2. Which of the following cannot be the constituent of the circuit ?

C alone

R,L

L,C

L alone