Question

The resistance $R=10\Omega$, inductance L = 2 mH and capacitance $cof5\mu F$ are connected in same to an AC source of frequency 50 Hz, then at resonance the impedance of circuit is

• A. zero
• B. $10\Omega$
• C. $1000\Omega$
• D. $10k\Omega$

Answer 1

The correct option is B $10\Omega$

At resonance, the capacitive reactance and the inductive reactance of the series LCR circuit become equal to each other and cancels each other. Therefore, the total impedance of the circuit will be only due to resistance.

So __ $R=10\Omega$