Magnets P3

Question 1

What is a Magnet?

Answer 1

A magnet is an object that can attract things made of magnetic materials

Question 2

Magnetic Materials

Answer 2

Iron & Steel

(Out of Syllabus: Nickel & Cobalt)

Question 3

Characteristics of Magnets

Answer 3

1. Two Poles: North & South
2. Poles of magnet have strongest magnetic force, while centre has weakest
3. Magnets can only attract magnetic materials
4. Freely suspended bar magnet will come to rest in the North-South direction

Question 4

Magnetic Force of Attraction

Answer 4

Opposite/Unlike poles of magnets face each other cause a pull towards each other

Question 5

Magnetic Force of Repulsion

Answer 5

Same/Like poles of magnets face each other and push each other away

Question 6

Stroking Method of making magnets

Answer 6

1. Use a bar magnet and stroke an iron bar continuously at least 20 times
2. Stroking must be done in one direction only with the same pole
3. Produces temporary magnets that lose their magnetism after some time
4. The greater the number of strokes, the greater the strength of the temporary magnets that lose

Question 7

Electromagnet/Electrical Method

Answer 7

1. Wind a wire around an iron bar around 30 times
2. Connect both ends to terminals of a battery
3. Iron bar becomes an electromagnet when switch is turned on due to the flow of electricity through the wire
4. The more batteries used, the stronger the electromagnet
5. The greater the number of coils of wire around the bar, the stronger the electromagnet