🧲 Part 1: Magnetic Field Patterns

1. What shape are the magnetic field lines around a straight current-carrying wire?

Straight lines pointing away from the wire

Circular lines around the wire

Oval shapes around the wire

Random curved lines

2. Inside a solenoid, the magnetic field is:

Circular and weak

Uniform and strong

Random and changing

Non-existent

3. Draw the magnetic field pattern around this straight current-carrying wire. Use the right-hand thumb rule to show field direction with arrows.

4. Sketch the magnetic field pattern around and inside this solenoid. Label the uniform field region.

⚡ Part 2: Field Strength and Current

5. What happens to the magnetic field strength when you increase the current in a wire?

6. Complete the sentences about magnetic field strength:

As you move further away from a current-carrying wire, the magnetic field becomes __________.

A uniform magnetic field has field lines that are __________ and __________.

To make an electromagnet stronger, you can increase the __________ or add an __________ core.

7. Which factors affect the strength of a magnetic field around a solenoid? Tick all that apply:

Current magnitude

Number of turns in the coil

Presence of an iron core

Colour of the wire

Distance from the solenoid

🔧 Part 3: Electromagnets in Action

8. Define an electromagnet:

9. Give three real-life examples of electromagnets and explain how they are used:

10. Extension Challenge: Explain why adding an iron core to a solenoid makes the electromagnet much stronger. Use your knowledge of magnetic materials in your answer.

11. Design Challenge: You need to design an electromagnet to pick up steel paperclips. List three ways you could make your electromagnet as strong as possible: