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Q.

In a circuit the phase difference between the alternating current and the source voltage is π/2. Which of the following cannot be the elements of the circuit?

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a

only C

b

Only L

c

L and R

d

L or C

answer is D.

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Detailed Solution

In only C, current leads voltage by π2
In only L, voltage leads current by π2
In case of L-R circuit, tan⁡ϕ=XLR, for ϕ→π2,R=0

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