Tag: let's make a magnet

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Questions Related to let's make a magnet

Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

A substance consisting of a coil of wire with an iron core and is only magnetized when an electric current flows through it is called :

  1. Magnet

  2. Electromagnet

  3. Coil

  4. Battery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The phenomenon of converting a substance into a magnet by flowing an electric current through a coil around it is known as electromagnetism and the magnet so formed is known as electromagnet.

Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

All magnetic materials lose their magnetic properties when :

  1. Dipped in water

  2. Dipped in oil

  3. Brought near a piece of iron

  4. Strongly heated
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
All the magnetic material lose their magnetic properties when strongly heated.
Every magnetic materials have a temperature called the curle point; above which they will lose their magnetism.
OPTION : D.
Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

Magnets lose their properties if :

  1. A.C. is passed through them

  2. heated strongly

  3. dropped from a height

  4. all of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

When a magnet is treated above 176℉ (80)℃ magnet will quickly loose their magnetic properties. The magnet will become permanently demagnetized if exposed to those temperatures for a certain length of time.

By passing an alternating current the magnetic property can be removed because the alternating current produces a reverse magnetizing field which opposes the object magnetism.

 

Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

A.  Ferromagnetic materials will lose their magnetism if heated above a point known as the Curie temperature.
B. You would have to re-magnetize the magnet again, either in a solenoid or with another permanent magnet, in order to restore the magnetism.
C. If you heat a magnet up a little bit, it will lose some of its magnetism, but on returning to room temperature full magnetism can be restored. 
Which among the following is/are true?

  1. Only A

  2. Both A and B

  3. Only C

  4. All A, B and C
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All the three statements are true that the ferromagnetic materials lose their magnetism on heating above the Curie temperature,

The magnet has to re-magnetized with another magnet or solenoid to restore its magnetism and the magnetism of the magnet is fully recovered when it is kept at room temperature after heating.

Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

By which of the following activity, a magnet can loose its property?

  1. Excess of heating

  2. Demagnetizing magnetic field

  3. Sudden shock

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
A magnet shows magnetic behavior because of the presence of domains which are specific formations consisting of electrons which exhibit magnetic behavior.
By all these actions, all the arranged magnetic domains which exhibit magnetic property due to their specific arrangement get rearranged and that specific formation of magnetic domain which is responsible for its magnetic behavior is destroyed.
And hence the magnet will loose its magnetic behavior.
Multiple choice physics properties of a magnetic field let's make a magnet making magnets making and handling magnets

A mixture of iron and nickel can be easily magnetized, even in a weak field. Which results in the formation of a ________. Fill in the blank.

  1. Permanent Magnet

  2. Electromagnet

  3. Temporary Magnet

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A mixture of iron and nickel is magnetized by applying an external magnetic field. This convert the mixture into a temporary magnet for the time when the field has been applied.

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

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

  1. preservatives

  2. keepers

  3. compasses

  4. poles
Reveal answer Fill a bubble to check yourself
B Correct answer
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.