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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Magnetism of a magnet can be destroyed by

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

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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)?

270
90
180
360

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Magnetism and Electromagnetism
Fleming's left hand rule is used to find

Direction of magnetic field due to current carrying conductor
Polarity of a magnetic pole
Direction of flux in a solenoid
Direction of force on a current carrying conductor in a magnetic field

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Magnetism and Electromagnetism
The uniform magnetic field is

The field of a single conductor
The field in which all lines of magnetic flux are parallel and equidistant
None of the listed here
The field of a set of parallel conductors

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Magnetism and Electromagnetism
The ability of a material to remain magnetized after removal of the magnetizing force is known as

permeability
retentivity
reluctance
hysteresis

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Magnetism and Electromagnetism
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m?

8 AT
16 AT
4 AT
10 AT

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MORE MCQ ON Magnetism and Electromagnetism

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