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Magnetism and Electromagnetism

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

Increase
Decrease
Be excessive
Remain Constant

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

0.24 AT
2.4 AT
240 AT
24 AT

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Magnetism and Electromagnetism
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle

will depend on the radius of the circle
will be zero
will be infinite
will depend on the amount of e.m.f. applied

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Magnetism and Electromagnetism
A rectangular magnet of magnetic moment M is cut into two piece of same length, the magnetic moment of each piece will be

M/2
2M
M/4
M

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Magnetism and Electromagnetism
The induced voltage across a stationary conductor in a stationary magnetic field is

decreased
increased
reversed in polarity
zero

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Magnetism and Electromagnetism
The main constituent of permalloy is

Tungsten
Cobalt
Nickel
Chromium

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MORE MCQ ON Magnetism and Electromagnetism

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