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Magnetism and Electromagnetism

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?

4 AT
16 AT
10 AT
8 AT

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

reluctance
permeance
residual magnetism
susceptance

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Magnetism and Electromagnetism
The commonly used material for shielding or screening magnetism is

Aluminium
Brass
Soft iron
Copper

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Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Silver and copper
Copper
Iron
Silver

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Magnetism and Electromagnetism
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength?

250 AT/m
0.25 AT/m
2500 AT/m
25 AT/m

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

increased
decreased
reversed in polarity
zero

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