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Magnetism and Electromagnetism

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

24 At
240 At
2,400 At
2.4 At

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Magnetism and Electromagnetism
The unit for reluctance is

At/Wb
At/m
tesla
Wb

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Magnetism and Electromagnetism
Materials subjected to rapid reversal of magnetism should have

High permeability and low hysteresis loss
High co-ercivity and low density
Large area of B-H loop
High co-ercivity and high retentivity

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Magnetism and Electromagnetism
Which of the following is expected to have the maximum permeability ?

Ebolite
Copper
Zinc
Brass

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

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
A line of magnetic flux in a non-uniform field

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Magnetism and Electromagnetism
Strength of an electromagnet can be increased by

Increasing the cross-sectional area
All of the listed here
Increasing current supply
Increasing the number of turns

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MORE MCQ ON Magnetism and Electromagnetism

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