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At resonance, ωL = 1 / ωC. The circuit behaves as if it contains R only. So, phase difference = 0

1. At resonance, impedance is minimum Zₘᵢₙ = R and current is maximum, given by Iₘₐₓ = E / Zₘᵢₙ = E / R
2. It is interesting to note that before resonance the current leads the applied emf, at resonance it is in phase, and after resonance it lags behind the emf.
3. LCR series circuit is also called as acceptor circuit and parallel LCR circuit is called rejector circuit.
4. At resonance, ωL = 1 / ωC. The circuit behaves as if it contains R only. So, phase difference = 0

Correct answer: At resonance, impedance is minimum Zₘᵢₙ = R and current is maximum, given by Iₘₐₓ = E / Zₘᵢₙ = E / R

Solution

Option A is correct because at resonance, the impedance of the LCR circuit is minimum and equals the resistance R, leading to maximum current given by Iₘₐₓ = E / R.

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