Electronic Principles
What is the impedance of a circuit composed of a 100 ohm resistor connected in parallel with a capacitor that has a reactance of 100 ohm?

60 Ohm
99.3 Ohm
70.7Ohm
250 Ohm
None of these

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Electronic Principles
The south pole of a magnet is the one:

that would be attracted to the earth's south magnetic pole
None of these
that has its molecules arranged in a random pattern
that would be repelled by the north pole of another magnet
that would be attracted to the earths north magnetic pole

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Electronic Principles
When a series RLC circuit is operating at its resonant frequency:

None of these
capacitive reactance is greater than the inductive reactance
the difference between inductive and capacitive reactance is equal to the resistance
inductive reactance is greater than the capacitive reactance
inductive reactance is equal to the capacitive reactance

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Electronic Principles
Which one of the following statements best describes magnetic hysteresis?

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently
None of these
Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet
Hysteresis is most apparent when the core material is saturated
Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet

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