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
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
None of these

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Electronic Principles
Which one of the following is a statement of Kirchhoffs current law?

The current through a resistance is proportional to the value of resistance and the IR drop across it
The algebraic sum of currents entering and leaving a point is equal to zero
The algebraic sum of currents in a loop is equal to zero
None of these
The total current in a parallel circuit is less than the value of the smallest current

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Electronic Principles
Which one of the following statements best applies to a series RLC circuit?

The current waveform for each component always has the same amplitude and phase as the applied current
The voltage waveform for each component always has the same amplitude and phase as the applied voltage
None of these
All of these
The sum of the current is always less than the applied current

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