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  4. Assertion Resonance phenomenon is exhibited by a circuit only if both L and C are present in the circuit. Reason Voltage across L and C cancel each other and the current amplitude is Vm / R, the total source voltage appearing across R causes resonance.

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Q. Assertion Resonance phenomenon is exhibited by a circuit only if both $L$ and $C$ are present in the circuit.
Reason Voltage across $L$ and $C$ cancel each other and the current amplitude is $V_{m} / R$, the total source voltage appearing across $R$ causes resonance.

Alternating Current

Solution:

It is important to note that resonance phenomenon is exhibited by a circuit only if both $L$ and $C$ are present in the circuit. Only then do the voltage across $L$ and $C$ cancel each other (both being out of phase) and the current amplitude is $V_{m} / R$, the total source voltage appearing across $R$. This means that we cannot have resonance in a $R-L$ or $R-C$ circuit.