Electromagnetics

Question 1

What two things can magnets do?

Answer 1

Repel and attract.

Question 2

What are the 4 magnetic materials?

Answer 2

Iron,Cobalt,Nickel,Steel.

Question 3

What is a magnet?

Answer 3

A material that exerts a magnetic force on other magnets or magnetic materials.

Question 4

What is a magnetic field?

Answer 4

The region around a magnet where a magnetic force can be felt.

Question 5

What are the two ends of a magnet called.

Answer 5

North and South

Question 6

Bar magnets are …..

Answer 6

Permanent magnets

Question 7

What is the law of magnets?

Answer 7

Unlike poles attract

Like poles repel

Question 8

What is the direction of the magnetic force field ?

Answer 8

Away from the
North
Towards the
South

Question 9

What happens if a magnetic material is placed in a magnetic field?

Answer 9

It will experience a force.

Question 10

How do you show the shape of a magnetic field?

Answer 10

By drawing magnetic field lines.

Question 11

What is the magnetic field of a magnet?

Answer 11

The region around a magnet where a magnetic force is.

Question 12

Electromagnets are…

Answer 12

Temporary magnets

Question 13

What can you do to electromagnets?

Answer 13

Turn them on and of.
(Turn the current on,the magnet will be on)
(Turn current off,the magnet will be off)

Question 14

What 3 things does the strength of an electromagnet rely on?

Answer 14

1. )Weather it has a core of iron
2. )how many coils the wire has
3. )how much current flows through the wire

Question 15

What do bar and electromagnets magnets have in common?

Answer 15

Both electromagnets and bar magnets have the same magnetic field around them .

Question 16

How do you make an electromagnet?

Answer 16

Using a piece of coiled wire with a current flowing through it.

Question 17

How does the strength of an electromagnet change ?(1)

Answer 17

The further from the electromagnet, the weaker the force .

Question 18

What is a domain?

Answer 18

Little groups of atoms that act like tiny magnets .Each little group of atoms is called a domain.

Question 19

Why does a normal piece of iron,nickel cobalt not seem to be magnetic?

Answer 19

Because all the domains are pointing in different directions, cancelling each other out.

Question 20

What happens when a piece of iron is magnetised?

Answer 20

The domains line up, no longer cancelling each other out .

Question 21

How can you make a magnet?

Answer 21

1. )You can magnetise a piece of iron by stroking it (You have to stroke it in the same direction, so that all the domains lineup )
2. )you can magnetise a piece of iron by leaving it next to another magnet for awhile (Eventually the domains move around so they are lined up)

Question 22

How can you de-magnetise a magnet?

Answer 22

By getting the domains to point in different directions

1. )heating the magnet (I know why)
2. )hammer a magnet(vibrations de-align the domains cancelling each other out)

Question 23

How can you NOT remove magnetism?

Answer 23

NOT by cutting it up. If you break a magnet into two, the 2 halves would be both magnets, each with the North and South Pole. This is because all the domains would be still aligned.

Question 24

FOCUS ON MAGNETIC FIELD QUESTION 2.
QUESTION D.).
IN SCIENCE ONE DRIVE.

Answer 24

…write answer to question once found out .

Question 25

What do you coils do in electromagnets?

Answer 25

The small magnetic field is caused by the coils, altogether make a stronger magnetic field, resulting in a larger magnetic force.

Question 26

What is an electromagnet?

Answer 26

A magnet that has a core ,sometimes made out of a magnetic material, a current flowing through the wire and coils of electrical wire.

Question 27

An iron core will make an electromagnet is stronger because…

Answer 27

Iron is a magnetic material and concentrates the magnetic field

Question 28

What’s a solenoid?

Answer 28

A solenoid Is a type of electromagnet. The purpose of a solenoid is to generate a controlled magnetic field through a coil wound into a tightly packed helix.