In series combination of $R, L, C$ with an A.C source at resonanace, if $R = 20$ ohm, then impedence $Z$ of the combination is

20

ohm

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zero

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10

ohm

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400

ohm

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Solution

The correct option is A $20$ ohm
We know at resonance, reactance (resistance due to inductor and capacitor) be zero (0).
At resonance, Impedance (Z) $=$ Resistance (R)
Therefore, $Z = 20$ ohm

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