Electronic Principles
To get the Norton current, you have to

Open the voltage source
Open the load resistor
Short the voltage source
None of these
Short the load resistor

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

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

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