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Q.

An inductance L, a capacitance C and a resistance R may be connected to an ac source of angular frequency ω , in three different combinations of RC, RL and LC in series. Assume that ωL=1ωC. The power drawn by the three combinations are P1 , P2 , P3 respectively. Then

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a

P1 = P2 > P3

b

P1 = P2 < P3

c

P1 > P2 > P3

d

P1 = P2 = P3

answer is B.

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Detailed Solution

In RC circuit p1=E0I02cosϕ , Where cosϕ=RZ

In RL circuit p2=E0I02cosφ , Where cosϕ=RZ

ϕ is same for both RC and RL circuits , so P1=P2

In LC circuit P , As there is no resistor in LC circuit it consumes no power. 

Therefore P1=P2>P3

 

 

 

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