Electronic Principles
Current can flow through a normally open push button switch as long as:

its contact remain open
its contact remain open
you are not pressing the button
you are pressing the button
None of these

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Electronic Principles
Doubling the operating frequency of a purely inductive circuit:

has no effect on the current through the inductors
doubles the amount of current through the inductors
None of these
cuts the current through the inductors one-half
increases the current, but by an amount that can be determined only by doing a complete analysis of the circuit

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