AC Fundamentals, Circuit and Circuit Theory
Time constant of a capacitive circuit

Increases with the increase of capacitance and decrease of resistance
Increases with the decrease of capacitance and decrease of resistance
Increase with increase of capacitance and increase of resistance
Increases with the decrease of capacitance and increase of resistance

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

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