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For a parallel RLC circuit, which one of the following statements is NOT correct?

1. The bandwidth of the circuit decreases if R is increased
2. The bandwidth of the circuit remains same if L is increased
3. At resonance, input impedance is a real quantity
4. At resonance, the magnitude of input impedance attains its minimum value

Correct answer: At resonance, the magnitude of input impedance attains its minimum value

Solution

At resonance in a parallel RLC circuit, the impedance is at its maximum, not minimum, because the reactive components cancel each other out, leading to a purely resistive input impedance.

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