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A resistor of 500 Omega , an inductance ...

A resistor of `500 Omega` , an inductance of `0.5 H` are in series with an a.c. which is given by `V = 100 sqrt2 sin (1000 t)` . The power factor of the combination is

A

`1/sqrt3`

B

0.5

C

0.6

D

`1/sqrt2`.

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