Chapter - 16 ( Magnetism)

Question 1

What are the ends of a magnet called?

Answer 1

Poles

Question 2

What are the end poles called?

Answer 2

• South Pole
• North Pole

Question 3

When do magnets experience attraction?

Answer 3

Unlike poles

Question 4

When do magnets experience repulsion?

Answer 4

Like poles

Question 5

What are properties that magnetic materials have?

Answer 5

• Experience a force when placed in magnetic field
• are attracted to magnet when unmagnetised
• can be magnetised to form

Question 6

Do non magnetic materials experience a force when placed in magnetic material?

Answer 6

No

Question 7

What are permanent magnets made out of?

Answer 7

Steel (Not always)

Question 8

Why is steel called permanent magnet?

Answer 8

Tend to stay magnetised

Question 9

What are the uses of permanent magnets?

Answer 9

• Compasses
• School lab experiments
• Toys
• Fridge magnets

Question 10

What is the use of electromagnets?

Answer 10

• Use electricity to create a magnet from a current - carrying wire

Question 11

what are the advantages of electromagnets?

Answer 11

• They can be magnetised and demagnetised at the flick of a switch
• they can be switched on and off

Question 12

What are the uses of electromagnets?

Answer 12

• MRI scans
• Speakers and earphones
• Recycling
• Mag lev trains

Question 13

What are the elements that are magnetic?

Answer 13

• Iron
• Cobalt
• nickel

Question 14

Why is stell also a magnet?

Answer 14

It is an alloy that contains iron

Question 15

What should we observe when a magnet Is brought closest to a known magnet.

Answer 15

• If it is repelled by known magnet then material is a magnet
• if it can only be attracted and not repelled, then it is not a magnet

Question 16

What’s re the 2 types of magnets?

Answer 16

• Permanent magnets
• Induced magnets

Question 17

Wha are the properties of permanent magnets?

Answer 17

• Made of steel
• Produce its own magnetic field
• does not lose magnetism

Question 18

What’s re the properties of induced magnets?

Answer 18

• temporarily magnet
• induced magnetism
• one end becomes north and the other South

-

Question 19

What happens when magnetism is induced on a material?

Answer 19

• one end of material becomes north pole
• other end will become South pole

Question 20

Why are magnetic materials attracted to permanent magnets?

Answer 20

End of a material closest to the magnetic will have the opposite poles to magnet pole closest to the material

Question 21

What happens when magnetic material is moved away from their permanent magnet?

Answer 21

Loses all it’s magnetic properties

Question 22

Define magnetic field.

Answer 22

The region around a magnet where a force acts on another magnet or on a magnetic material (such as iron, steel, cobalt and nickel)

Question 23

What are all magnets surrounded by?

Answer 23

Magnetic field

Question 24

When is a uniform field created?

Answer 24

When two opp poles are held together and magnetic fields always move from north to south

Question 25

what does a uniform magnetic field always have?

Answer 25

Same strength and direction at all points

Question 26

What do the magnetic field lines represent?

Answer 26

• Strength
• Direction
  Of magnetic field

Question 27

What shows the direction of the magnetic field?

Answer 27

arrows

Question 28

What are 2 important rules to remember when drawing magnetic field lines?

Answer 28

• always go from north to south
• must never touch or cross each other

Question 29

Where is the magnetic field in a bar magnet the strongest?

Answer 29

At the poles

Question 30

When does the magnetic field strength in a bar magnet become weaker and why?

Answer 30

• weaker as the distance from the magnet increases
• lines are further apart

Question 31

How is the strength of magnetic field shown?

Answer 31

• Spacing of lines

Close: String magnetic field

Far: weak magnetic field