In the given circuit what is the potential drop across resistance?

40 V

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80 V

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120 V

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zero

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Solution

The correct option is C 120 V
At resonance the voltage across L and C are same but opposite .

So, at resonance $| V_{L} | = | V_{C} |$

Therefore $V_{R} = V_{a p p} = 120 V$

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