Question

The phase difference between the alternating current and emf is TE/2. Which ofthe following cannot be the constituent of the circuit?
(a) C alone
(b) L alone
(c) L and C
(d) R and L

Answer 1

Answer:

If the phase difference between V and I is pi/2

Hence,Power=V×I=VI cos pi/2=0

Since power is 0 it could only consists of reactive elements(L&C),Resistance R canonot be present.

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Answer 2

Answer:

Correct answer is L. C

Explanation:

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