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Magnetism and Electromagnetism

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

24 At
2,400 At
2.4 At
240 At

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Magnetism and Electromagnetism
Hysteresis loop in case of magnetically hard materials is more in shape as compared to magnetically soft materials.

rectangular
triangular
None of the listed here
circular

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

susceptance
reluctance
residual magnetism
permeance

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Magnetism and Electromagnetism
The unit for reluctance is

At/m
Wb
At/Wb
tesla

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Magnetism and Electromagnetism
When the current through the coil of an electromagnet reverses, the

direction of the magnetic field reverses
magnetic field expands
magnetic field collapses
direction of the magnetic field remains unchanged

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Magnetism and Electromagnetism
A permeable substance is one

Which is a strong magnet
Which is a good conductor
Through which the magnetic lines of force can pass very easily
Which is a bad conductor

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MORE MCQ ON Magnetism and Electromagnetism

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