Electronic Principles
Suppose a voltage source has an ideal voltage of 12V and an internal resistance of 0.5W. For what values of load resistance will the voltage source appear stiff?

50 Ohm or more
100 Ohm
6 Ohm
5 Ohm
None of these

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

None of these
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
the core is permitted to move freely within the coil
an increase in current through the coil causes no further increase in the mmf

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Electronic Principles
The dielectric constant of a material is a measure of:

the amount of opposition to the current flow
the amount of voltage it can withstand before breaking down
None of these
how well the material concentrates magnetic lines of force
how well the material concentrates electrostatic lines of force

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