Electronic Principles
1 Microfarad is the same as:

None of these
1 millionth of a picofarad
1000 millifarads
1 million picofarads
1 million farads

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

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

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