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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Temporary magnets are used in

All of the listed here
Loud speakers
Generators
Motors

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Magnetism and Electromagnetism
Ferrites are materials.

Diamagnetic
Paramagnetic
Ferromagnetic
None of the listed here

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Magnetism and Electromagnetism
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be

BLI
Zero
None of the listed here
BLI2

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Magnetism and Electromagnetism
The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

1.7 mA
12 mA
120 mA
16 mA

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Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

Hammering
All of the listed here
Heating
By inductive action of another magnet

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Magnetism and Electromagnetism
Paramagnetic materials have relative permeability

slightly less than unity
equal to unity
equal to that ferromagnetic mate rials
slightly more than unity

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MORE MCQ ON Magnetism and Electromagnetism

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