Question

why current increases in case of resonance?
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Answer 1

Answer:

So, in a series resonant circuit, voltage across resistor is equal to supply voltage i.e V = Vr. ... At starting, when the frequency increases, the impedance Zc decreases and hence the circuit current increases.

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Answer 2

Answer:

At resonance, the impedance of the circuit decreases, and hence the circuit current increases.