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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Air gap has_______eluctance as compared to iron or steel path

little
zero
higher
lower

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Magnetism and Electromagnetism
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

22 x 10"7 N
22 x 10-6 N
22 x 10"5 N
22 x 10"8 N

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Magnetism and Electromagnetism
The unit for permeability is

At/Wb
At/m
Wb/At × m
Wb

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

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

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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

Remain Constant
Be excessive
Decrease
Increase

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

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

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MORE MCQ ON Magnetism and Electromagnetism

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