First slide

Electrical Resonance series circuit

Question

In the circuit shown in figure neglecting source resistance the voltmeter and ammeter reading will respectively, be

Moderate

A

0V, 3A
B

150V, 3A
C

150V, 6A
D

0V, 8A

Solution

The voltage $V_{L}$ and $V_{C}$ are equal and opposite so voltmeter reading will be zero.
Also $R = 30 Ω, X_{L} = X_{C} = 25 Ω$
so $i = \frac{V}{\sqrt{R^{2} + {(X_{L} - X_{C})}^{2}}} = \frac{V}{R} = \frac{240}{30} = 8 A$

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