Electronic Principles
Which one of the following statements is true for the currents in a parallel RL circuit?

The total current leads the total voltage by less than 90
The total current is equal to the sum of the currents through the resistance and inductance
None of these
The total current is less than the sum of the currents through the resistance and inductance
The current always has the same amplitude and phase for every part of the circuit

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

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

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Electronic Principles
What is the difference between the kinds of charges for an electron and a proton?

An electron has a positive charge and a proton has no charge
An electron has a negative charge and a proton has no charge
None of these
An electron has a positive charge and a proton has a negative charge
An electron has a negative charge and a proton has a positive charge

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