AC Fundamentals, Circuit and Circuit Theory
If two sinusoids of the same frequency but of different amplitudes and phase angles are subtracted, the resultant is

A sinusoid of the same frequency
A sinusoid of double the frequency
A sinusoid of half the original frequency
None of the listed here

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

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