Q.

The power factor of an ac circuit having resistance (R) and inductance (L) connected in series and an angular velocity ω  is

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a

R/ωL

b

R/(R2+ω2L2)1/2

c

ωL/R

d

R/(R2−ω2L2)1/2

answer is B.

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Detailed Solution

cosφ=RZ=R(R2+ωL2)1/2
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