Question

A resistance $\left(R\right)=12\Omega$; inductance $\left(L\right)=2$ henry and capacitive reactance $C=5mF$ are connected in series to an ac generator, then:

• A. at resonance, the circuit impedance is zero
• B. at resonance, the circuit impedance is $12\Omega$
• C. the resonance frequency of the circuit is $1/2\pi$
• D. at resonance, the inductive reactance is less than the capacitive reactance

Answer 1

The correct option is B at resonance, the circuit impedance is $12\Omega$

At resonance

$X_L=X_C\therefore z=R$

So, circuit impedence is $12\Omega$