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Magnetism and Electromagnetism

Magnetism and Electromagnetism
An electromagnetic field exists only when there is

decreasing current
an increasing current
voltage
current

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Magnetism and Electromagnetism
A keeper is used to

Provide a closed path for flux
Change the direction of magnetic lines
Restore lost flux
Amplify flux

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Magnetism and Electromagnetism
The retentivity of material is useful for the construction of

Permanent magnets
Non-magnetic substances
Transformers
Electromagnets

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Magnetism and Electromagnetism
If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Is zero
None of the listed here
Decrease
Increase

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Magnetism and Electromagnetism
What is the magneto-motive force (mmf) of a wire with 8 turns carrying three amperes of current?

2,400 At
240 At
2.4 At
24 At

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Magnetism and Electromagnetism
In the left hand rule, forefinger always represents

direction of force on the conductor
current
Voltage
magnetic field

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MORE MCQ ON Magnetism and Electromagnetism

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