False 1. An electromagnet may be produced by making electricity flow through a coil of wire wound around an iron nail.
False 2. When electricity stops flowing through a coil of wire, the nail continues attracting any metal or magnetic materials.
False 3. An electromagnet can be made stronger by using less coils of wire.
False 4. The number of dry cells used affects the magnetism of an electromagnet. More dry cells mean less magnetism.
False 5. Electromagnets are permanent magnets that can attract any metal or magnetic material.
Underlined word Replacement:
1.can
2.stops
3.more
4.more
5.temporary
Explanations:
Electricity and magnetism are closely related to each other. Electricity can produce
magnets while magnets can produce electricity. A magnet is usually made of iron. It can attract objects such as pins, coins, and other
materials made of iron and steel. A nail is not a magnet, but it can be turned into one. This is done by coiling a wire around it and then letting electricity flow through it. Doing this turns the nail into an electromagnet.
An electromagnet attracts like a real magnet. It can attract materials made of metals
like pins and thumbtacks. The iron nail acts as a magnet while electricity is flowing through the coil of wire. Electromagnets are temporary magnets. When electricity stops flowing through a coil of wires, the nail stops attracting any metal or magnetic material.
An electric motor is a device that uses electricity to make objects move. Electric
motors make home devices like refrigerator and washers operate. Automobiles use electric motors in the starter and heater fan. Other devices such as vacuum cleaners, mixers and electric drills make use of motors operating on electricity.
Electromagnetism was introduced by a Danish scientist named Hans Christian
Oersted in 1820, where he built an electromagnetic coil. He was the first to notice that when electrons flowed through a wire, a nearby compass needle moved. This showed that there is a magnetic field around a wire carrying electricity. .
An electromagnet is a type of magnet in which the magnetic field is produced by
an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field.
