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

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AC Fundamentals, Circuit and Circuit Theory
A phasor is

An instrument used for measuring phases of an unbalanced 3-phase load
A colored tag or band for distinction between different phases of a 3-phase supply
A line representing the magnitude and direction of an alternating quantity
A line which represents the magnitude and phase of an alternating quantity

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