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Magnetism and Electromagnetism

Magnetism and Electromagnetism
Which of the following materials are diamagnetic?

Silver
Iron
Silver and copper
Copper

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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

Be excessive
Increase
Remain Constant
Decrease

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Magnetism and Electromagnetism
The change of cross-sectional area of conductor in magnetic field will affect

None of these
both of the listed here
reluctance of conductor
resistance of conductor

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Magnetism and Electromagnetism
A permeable substance is one

which is a good conductor
which is a bad conductor
which is a strong magnet
through which the magnetic lines of force can pass very easily

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Magnetism and Electromagnetism
The most effective and quickest may of making a magnet from soft iron is by

The use of permanent magnet
Rubbing with another magnet
Induction
Placing it inside a coil carrying current

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Magnetism and Electromagnetism
What is the magneto-motive force in a 75-turn coil of wire when there are 4 A of current through it?

300 AT
0.3 AT
3 AT
30 AT

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