An $A C$ voltmeter in an $L - C - R$ circuit reads 30 volt across resistance, 80 volt across inductance and 40 volt across capacitance. The value of applied voltage will be

50 Volt

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25 Volt

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150 Volt

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70 Volt

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Solution

The correct option is A 50 Volt
$V = \sqrt{V_{R}^{2} + {(V_{L} - V_{C})}^{2}}$
$V = \sqrt{30^{2} + {(80 - 40)}^{2}}$
$V = 50$ volt

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