The impedance at resonance offered by a parallel resonant circuit is

• A. Minimum given by I/CR
• B. Maximum given by I/CR
• C. Minimum given by L/CR
• D. Maximum given by L/CR

Answer: (D)

A practical parallel resonance circuit is represented by an inductance and a resistance id one branch and a capacitance in other branches.
At resonance in a practical parallel resonance circuit, the impedance is maximum. Hence, it is called a rejector circuit, and it exhibits the property of voltage magnification.
Z = L/CR