Pupil sheet · Magnets and magnetic fields
Magnets and magnetic fields — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. describe / state
A pupil holds a bar magnet in each hand and brings the S pole of one towards the S pole of the other. Then she turns one magnet round, so that its N pole faces the S pole of the other. Describe the force she feels each time, and state the rule that explains it.
S facing S
N facing S
The rule
2. describe
Describe how to use a plotting compass to find the direction of the magnetic field at a point near a magnet, and explain why this method gives the direction.
What to do
Why it gives the direction
3. state
(a) State what is meant by a magnetic field. (b) State the direction of the field lines outside a bar magnet. (c) State why two field lines can never cross.
(a) Magnetic field
(b) Direction outside a bar magnet
(c) Why lines never cross
4. explain / state
Supplement. (a) Explain what is meant by the statement “magnetic forces are due to interactions between magnetic fields”. (b) State how a drawing of field lines shows the relative strength of a magnetic field.
(a) Interactions between fields
(b) Showing strength
5. identify
Identify two metals that are magnetic materials and two metals that are non-magnetic.
Magnetic metals
Non-magnetic metals
6. describe
Describe what is meant by induced magnetism. Use the example of a steel paper clip near the N pole of a magnet, and state which pole forms at each end of the clip.
Induced magnetism
The poles of the clip
7. identify
Which row of the table gives the best material for each object?
| Row | Compass needle | Core of a crane’s electromagnet |
|---|---|---|
| A | soft iron | steel |
| B | steel | soft iron |
| C | copper | soft iron |
| D | steel | steel |
Circle one answer.
- A
- B
- C
- D