# Resonance and its applications

### Explanation of question 7

In Fig. 10.2, the circuit is at resonance. The voltmeter will read

1. zero
2. the same as the supply voltage
3. twice the supply voltage
4. a very high value

The answer is :- 1 7 The voltage across L will be equal in magnitude to the voltage across C, but anti-phase. When two equal but anti-phase voltages combine in a series circuit, they will give a zero reading on the voltmeter.

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