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Q.

In an AC, L-R circuit, the inductive reactance is equal to the resistance R in the circuit. An emf E = E0 cos ωt is applied in the circuit, then the power consumed in the circuit is 

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a

E02R2

b

E024R

c

E022R

d

E028R

answer is B.

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Detailed Solution

Power consumed in ac circuit is Ermsirmscosϕ

Here impedence=Z=R2+R2=2R

Power=ErmsErmsZRZ=E022R22R=E024R

 

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