Question # 1

The best materials to protect a device from external magnetic field is

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Sot iron

Steel

wood

Plastic

Which one of the following is not a magnetic material

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Iron

Nickel

Aluminium

Cobalt

The cause of the Earth's magnetic field is.

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Rotational motion of Earth

Motion of ions in the core

Spinnig of Earth

Pull of the sun

material which is the best one for making a permanent magnet.

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Nickel

Steel

Soft iron

Cobalt

Megnetic lines of force

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Enter into the north pole

Cross one another

Are alwyas directed in a straight line

Enter into the south pole

Permanent magnets are used in

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Circuit breaker

Loudsppeaker

Electric crane

Magnetic recording

Which one is the quicket method to magnetize a material

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Strike with hammer

Putting inside a current carrying coil

Moving into magnetic field

Stroking the opposite pole

When two curreint carrying wires in the same direction are placed parrallel near each other. due to magnetic field produced by each wire they.

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Repeal each other

Stop moving the current through them

Attract each other

Have no effect on each other

Permanent magnet cannot be made by

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Steel

Alnico

Soft iron

Neodymum

Material which is the best one for making an electromagnet.

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Steel

Soft Iron

Cobalt

Nickel

A common method used to meagnetics a materials is.

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Hitting

Heating

Stroking

Placing inside a solenoid having AC current

Magnetic field lines.

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Are colosed

Are farthest at poles

Intersect each other

Do not pass in vacuum

Asensitive magnetic material is to shielded by theexternal magnetic field. It should be kept inside a box of.

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Soft Iron

Plastic

Steel

Wood

If a bar magnet is cut in half it will become

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A monopole

Magnetized

Magnet of less strength

The same magnet

Which of the following material is ferromagnetic

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Nickel

Copper

Alluminum

Silver

Earth's magnetic field intensity is.

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Constant every warre

Very low at poles

Varies place to place

Very high at equator

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