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Magnetism and Electromagnetism

Magnetism and Electromagnetism
When the north poles of two bar magnets are brought close together, there will be

a force of attraction
no force
a downward force
a force of repulsion

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

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

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Magnetism and Electromagnetism
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)?

180
90
270
360

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

susceptance
reluctance
permeance
residual magnetism

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Magnetism and Electromagnetism
One telsa is equal to

1 Wb/m²
1 Wb/m
1 Wb/mm²
1 mWb/m²

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Magnetism and Electromagnetism
The Biotsavart's law is a general modification of

Lenz's law
Ampere's law
Kirchhoff's law
Faraday's laws

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MORE MCQ ON Magnetism and Electromagnetism

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