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Question

An $$AC$$ 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


A
50 Volt
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B
25 Volt
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C
150 Volt
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D
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

Physics

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