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Magnetism and Electromagnetism

Magnetism and Electromagnetism
There is 900 mA of current through a wire with 40 turns. What is the reluctance of the circuit if the flux is 400 Wb?

14,400 At/Wb
1,440 At/Wb
9,000 At/Wb
90,000 At/Wb

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Magnetism and Electromagnetism
The use of permanent magnets is. not made in

Loud speakers
None of the listed here
Energy meters
Transformers

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

3 AT
30 AT
0.3 AT
300 AT

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Magnetism and Electromagnetism
The magnetism left in the iron after exciting field has been removed is known as

susceptance
permeance
reluctance
residual magnetism

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Magnetism and Electromagnetism
The stray line of magnetic flux is defined as

A line of magnetic flux in a non-uniform field
The mean length of a ring shaped coil
A line vertical to the flux lines
A line of magnetic flux which does not follow the designed path

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

Induction
The use of permanent magnet
Placing it inside a coil carrying current
Rubbing with another magnet

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MORE MCQ ON Magnetism and Electromagnetism

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