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Magnetism and Electromagnetism

Magnetism and Electromagnetism
What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

30 At
187 At
18.75 At
300 At

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Magnetism and Electromagnetism
What is the mmf of a wire with 8 turns carrying three amperes of current?

240 AT
0.24 AT
2.4 AT
24 AT

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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

Increase
Decrease
Is zero
None of the listed here

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Magnetism and Electromagnetism
A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Increases
Decreases
Remain same
None of the listed here

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Magnetism and Electromagnetism
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be

0.01 N
0.1 N
100 N
10 N

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Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

250 AT/m
25 AT/m
0.25 AT/m
2500 AT/m

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Magnetism and Electromagnetism

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