Electric Circuits
A variable capacitance is one whose capacitance

 can be changed manually or by mechanical force.
 changes with voltage.
 changes with time.
 changes with temperature.

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Electric Circuits
What is called the instantaneous value of an alternating current?

 The value of peak current at any instant.
 The value of peak quantity at any instant.
 The value of alternating frequency at any instant.
 The value of alternating quantity at any instant.

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