Tag: fun with magnets

Questions Related to fun with magnets

A permanent magnet can lose its magnetism with time 

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. True

  2. False

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Correct Option: A
Explanation:
Yes permanent magnet can lose its magnetism in following cases
i) Heating up to certain temperature
ii) Low coercivity and wrong storage.
iii)Energy transfer them by shock.

When the north pole of a bar magnet picks up an iron nail which of the following are induced in the nail ?

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. North poles

  2. South poles

  3. A north pole and south pole

  4. None of these

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Correct Option: B
Explanation:

As the attraction occurs only in between two unlike poles, thus north pole of magnet induces south pole in the nail and north at the other end.

The force with which a magnet attracts objects like iron is called Magnetic force.

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. True

  2. False

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Correct Option: A
Explanation:

Magnetic force

All magnetic materials lose their magnetic properties when:

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. Dipped in water

  2. Dipped in oil

  3. Brought near a piece of iron

  4. Strongly heated

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Correct Option: D
Explanation:
Curie- Temperature:
The temperature at which any magnetic field material loses its magnetic property which is at a much higher temperature thus being strongly heated,
Magnets can be demagnetized.

Soft iron pieces are placed across the ends of bar magnets when stored. Such pieces are called :

physics fun with magnets let's make a magnet making magnets making and handling magnets

  1. preservatives

  2. keepers

  3. compasses

  4. poles

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Correct Option: B
Explanation:

Soft iron pieces are placed across the ends of bar magnets when stored; such pieces are called magnetic keepers. If the two magnets are placed side by side there will be mutual repulsion or attraction that weakens the magnetic strength. So magnets are placed side by side with opposite poles near to each other.