Electromagnet

Q.

Give one advantage of an electromagnet over a permanent magnet.

Q.

List the various methods of making a magnet.

Q.

An electric bell is an example of a/an ___ magnet.

Q. Which type of magnet is used in an electric bell?

1. Bar magnet
2. Cylindrical magnet
3. Electromagnet
4. Horseshoe magnet

Q.

What Is The Young One Of A Swan Called?

Q.

Which of the following statements is NOT correct about an electromagnet?

1. It works as long as current is flowing through a solenoid.

2. It is used in fans and radio.

3. It is a permanent magnet.

4. The magnetic field strength can be varied.

Q. Which among the following appliance(s) do not use an electromagnet?

1. Electric Bell
2. Refrigerator
3. Crane
4. Pin holder

Q. The magnetic effect due to the electric current is called _____

1. magnetisation
2. electromagnetism
3. gyromagnetism
4. magneto

Q.

An electromagnet is a ___________ with a soft iron core.

Q.

Describe U-shaped electromagnets

Q. How can you make a magnet without electricity?

Q.

What is an electromagnet and how is it different from a permanent magnet? Also state Why is iron used as the core of an electromagnet?

Q. Which of the following appliances does not use an electromagnet?

1. Fan
2. Radio
3. Electric bell
4. Electric Heater

Q.

Write two uses of electromagnets?

Q. The flow of electricity can show magnetic effect.

1. True
2. False

Q. The applications of electromagnetism are used in

1. A door bell
2. A crane
3. Maglev train
4. A pin holder

Q.

Which of the following materials is best suited as the core of an electromagnet?

1. Steel

2. Iron

3. Alnico

4. Magnetite

Q. Magnetism exists even if the flow of current is stopped in a coil.

1. True
2. False

Q. List five such electrical gadgets in your house in which electromagnets is used.

Q. Name the following:

Q. Assertion :For making permanent magnets, steel is preferred over soft ion. Reason: As retentivity of steel is smaller

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. An insulated copper wire is wound around a steel nail and current is passed for some time. The nail will change to a:

1. permanent magnet
2. none of the above
3. temporary magnet
4. will not get magnetised

Q. What is an electromagnet?