B. Modified True or False. Put a ✅if the statement If false, change the underlined
1. Electromagnet is a temporary magnet.
2. The device that use magnets and loop of wires to make electricity is an electric motor.
3. A magnet has three magnetic poles.
4. To make an electromagnet works, there should be a complete circuit.
5. The more number of loops of wire around the iron core increases the strength of
electromagnets.
6. An electromagnet can be made stronger and weaker.
7. You can vary the strenght of an electromagnet by adding only electric current from it.
8. Electricity and magnets are not closely related to each other.
9. An electric current running through a loop of wire makes an electromagnet.
10. If the electric current is shut off, the electromagnet is still magnetic.

The underlined you will change if false.

1. temporary
2. electric motor
3. three
4. complete circuit
5. increases
6. stronger and weaker
7. electric current
8. not closely related
9. electromagnet
10. still magnetic

Electric GeneratorsGenerators use motion to create electricity by means of magnets. Faraday's Law shows that when a wire is exposed to a changing magnetic field, an electrical current arises. When the axle of the generator is turned, the loop of wire turns.

3.FALSE

A MAGNET HAS TWO POLES

4.TRUE

dkopa sure

5.TRUE

6.TRUE

You can make an electromagnet stronger by doing these things: wrapping the coil around a piece of iron (such as an iron nail) adding more turns to the coil.

7.TRUE

Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. ... As the current flowing around the core increases, the number of aligned atoms increases and the stronger the magnetic field becomes.

8.TRUE

Electricity and magnetism are closely related.

9.TRUE

By simply wrapping wire that has an electrical current running through it around a nail, you can make an electromagnet. When the electric current moves through a wire, it makes a magnetic field. If you coil the wire around and around, it will make the magnetic force stronger, but it will still be pretty weak.

10.The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.

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