AC Fundamentals, Circuit and Circuit Theory
A parallel AC. circuit in resonance will

Have a high impedance
Have current in each section equal to the line current
Act like a resistor of low value
Have a high voltage developed across each inductive and capacitive section

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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 change the resonance frequency
Will change the impedance at resonance frequency
Will increase the selectivity of the circuit

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