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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AC Fundamentals, Circuit and Circuit Theory
The series and parallel resonance on L-C circuit' differs in that

Series resistance needs a low-resistance source for sharp rise in current
Parallel resonance needs a low-resistance source for a sharp increase in impedance
Series resonance needs a high-resistance source for sharp increase in current
Parallel resonance needs a low-resistance source for a sharp rise in line current

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AC Fundamentals, Circuit and Circuit Theory
An A.C. voltage is impressed across a pure resistance of 3.5 ohms in parallel with a pure inductance of impedance of 3.5 ohms,

None of the listed here
The current through the resistance is less
The current through the resistance is more
Both resistance and inductance carry equal currents

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