In a series combination of $R, L$ and $C$ to an A.C source at resonance. If $R = 20 o h m$ , then impedence $Z$ of the combination is

20

ohm

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Zero

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1

ohm

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400

ohm

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Solution

The correct option is A $20$ ohm
At resonance, impedence $Z = R$
So, $Z = R = 20 o h m$

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