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

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

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Electronic Principles
The core of an electromagnet is said to be in saturation when:

changing the polarity of the current in the coil changes the polarity of the magnetic field around the core
the core is permitted to move freely within the coil
None of these
an increase in current through the coil causes no further increase in the mmf
frequent changes in the direction of current through the coil causes heating effects in the core material

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