Electronic Principles
Which one of the following kinds of materials has the highest permeability?

A ferromagnetic material
A diamagnetic material
None of these
All of these
A paramagnetic material

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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
An electron has a positive charge and a proton has a negative charge
None of these
An electron has a negative charge and a proton has a positive charge

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Electronic Principles
Which one of the following phrases most accurately describes a purely capacitive circuit?

None of these
The ac voltage leads the current by 90 degree
Resistances provide the only opposition to current flow
Combinations of resistance and capacitive reactance provide any opposition to current flow
Capacitive reactance provides the only opposition to current flow

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

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

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