A two branch parallel circuit has a 20 Ω resistance and 1 H inductance in one branch and a 100 μF capacitor in the second branch. It is fed from 100 V ac supply, at resonance, the input impedance of the circuit is

• 500 Ω
• 50 Ω
• 20 Ω
• 5 Ω

Correct Answer: 500 Ω

Explanation:

At parallel resonance circuit impedance = .