Electronic Principles
The current gain of a transistor is defined as the ratio of the collector current to the

None of these
supply current
collector current
base current
emitter current

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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
None of these
the core is permitted to move freely within the coil
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

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