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A resistor of 500 Omega and an indudance...

A resistor of `500 Omega` and an indudance of 0.5 H are in series with an AC source which is given by V = `100sqrt2` sin (1000 t). The power fador of the combination is

A

`1/sqrt2`

B

`1/sqrt3`

C

`0.5`

D

`0.6`

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