3-A-002: Magnetism
3-2A1:
What determines the strength of the magnetic field around a conductor?
The amount of current.
The resistance divided by the current.
The ratio of the current to the resistance.
The diameter of the conductor.
3-2A2:
What will produce a magnetic field?
A current flowing through a conductor.
A DC source not connected to a circuit.
The presence of a voltage across a capacitor.
The force that drives current through a resistor.
3-2A3:
When induced currents produce expanding magnetic fields around conductors in a direction that opposes the original magnetic field, this is known as:
Lenz’s law.
Gilbert's law.
Maxwell’s law.
Norton’s law.
3-2A4:
The opposition to the creation of magnetic lines of force in a magnetic circuit is known as:
Reluctance.
Eddy currents.
Hysteresis.
Permeability.
3-2A5:
What is meant by the term “back EMF”?
A voltage that opposes the applied EMF.
A current equal to the applied EMF.
An opposing EMF equal to R times C (RC) percent of the applied EMF.
A current that opposes the applied EMF.
3-2A6:
Permeability is defined as:
The ratio of magnetic flux density in a substance to the magnetizing force that produces it.
The magnetic field created by a conductor wound on a laminated core and carrying current.
Polarized molecular alignment in a ferromagnetic material while under the influence of a magnetizing force.
None of these.
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