AC Fundamentals, Circuit and Circuit Theory
Inductance of coil

Becomes zero with the increase in supply frequency
Decreases with the increase in supply frequency
Increases with the increase in supply frequency
Is unaffected by the supply frequency

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AC Fundamentals, Circuit and Circuit Theory
In series resonant circuit, increasing inductance to its twice value and reducing capacitance to its half value

Will change the maximum value of current at resonance
Will increase the selectivity of the circuit
Will change the resonance frequency
Will change the impedance at resonance frequency

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