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The impedance of a series R-C, AC circui...

The impedance of a series R-C, AC circuit is `Z_1` for frequency f and `Z_2` for 2f. If `Z_1/Z_2=k`, then

A

k=`1`

B

`0ltklt1`

C

`1ltklt2`

D

k=`2`

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