Electromagnetism

Question 1

Describe the relationship between magnetism and electricity. How can and electromagnet be created?

Answer 1

An electromagnet is a bar of iron wrapped with a coil of wire carrying an electric current.

Question 2

True or False:
Magnetite also became known as Lodestone.

Answer 2

True

Question 3

True or False:
An electromagnet is made of a bar of metal wrapped with a coil of wire carrying an electric current.

Answer 3

False

Question 4

What are some uses of electromagnets?

Answer 4

Some uses of electromagnets are in telegraphs, doorbells, washing machines, motors, and telephones.

Question 5

How can the strength of an electromagnet increased?

Answer 5

More loops of wire or faster rotation of the wire can increase the strength of an electromagnet.

Question 6

What is the first principle of electromagnetic induction?

Answer 6

1. An electromagnetic current is produced when a magnet is moved through coil of wire in a closed circuit or when a wire is moved through a magnetic field.

Question 7

True or False:
Lodestones acted as the first magnets.

Answer 7

False
Lodestones acted as the first comopasses.

Question 8

What is the second principle of electromagnetic induction?

Answer 8

2. The faster the magnet or wire is moved, the greater the electric current.

Question 9

What is the third principle of electromagnetic induction?

Answer 9

3. More electric current is produced if more loops of wire are added to the coil.

Question 10

What did the properties of magnets produce?

Answer 10

The properties of magnets produce the spin in electric motors for powering transportation and in generators for creating electricity.

Question 11

Explain how a generator works.

Answer 11

A generator is a machine that converts mechanical energy into electrical energy.

Question 12

Electromagnet meaning:

Answer 12

A bar of iron wrapped with a coil of wire carrying an electric current.

Question 13

Electromagnetic Induction meaning:

Answer 13

The process by which electric current is produced by a changing magnetic field.

Question 14

What is magnet and what causes magnetism?

Answer 14

A magnet is a substance that exhibits a property called magnetism

Question 15

What are the magnets certain properties?

Answer 15

They have 2 magnetic poles, exert magnetic forces that are either attractive or repulsive and are surrounded by a magnetic field

Question 16

Electromagnetism meaning:

Answer 16

The relationship between electricity and magnetism.

Question 17

Generator meaning:

Answer 17

A machine that converts mechanical energy into electrical energy.

Question 18

What are the magnets certain properties?

Answer 18

They have 2 magnetic poles, exert magnetic forces that are either attractive or repulsive and are surrounded by a magnetic field

Question 19

True or False?
The ability of a magnet to deconstruct magnetic materials is strongest at the ends of the magnet, the magnetic poles, but the magnetic force extends along the whole length of the magnet.

Answer 19

False

Question 20

True or False?
The region around a magnet in which magnetic forces can act is called the magnetic field.

Answer 20

True

Question 21

What is it called when one point of the magnet points North?

Answer 21

It’s called the “North Pole”.

Question 22

Why does the North Pole of a magnet and the south magnet attract each other when they approach each other?

Answer 22

This is because of the rule “opposites attract”

Question 23

What gives a magnet 2 poles and a magnetic field?

Answer 23

The atoms of a magnetic materials act like tiny, individual magnets. These tiny magnetic, or atoms attract other atoms to line up so their North piles face the same direction.

Question 24

What is a magnetic domain?

Answer 24

Within a magnet a region where the magnetic field of individual atoms are lined up. This is called a magnetic domain.

Question 25

True or False:
When the atoms in the material line up, the combined magnetic field makes the material a magnet.
In most materials, the magnetic domain

Question 26

What did Hans Christian Oersted get surprised about?

Answer 26

He noticed that whenever he brought his compass close to a live electrical wire, the needle of the compass jumped. The needle moved 90° when the electric current was turned on.