Draw the field around two magnets south poles facing each other.
Important Questions on Magnets
Sarah did an investigation into how the type of core in an electromagnet affects its strength. She measured how many paper clips each picked up. She obtained the results shown in table.
| Core type | Number of paper clips picked up |
| Air | |
| Copper | |
| Iron |
What was the independent variable in this investigation?
Sarah did an investigation into how the type of core in an electromagnet affects its strength. She measured how many paper clips each picked up. She obtained the results shown in table.
| Core type | Number of paper clips picked up |
| Air | |
| Copper | |
| Iron |
What was the dependent variable in this investigation?
Sarah did an investigation into how the type of core in an electromagnet affects its strength. She measured how many paper clips each picked up. She obtained the results shown in table.
| Core type | Number of paper clips picked up |
| Air | |
| Copper | |
| Iron |
Name one control variable in this investigation?
Sarah did an investigation into how the type of core in an electromagnet affects its strength. She measured how many paper clips each picked up. She obtained the results shown in table.
| Core type | Number of paper clips picked up |
| Air | |
| Copper | |
| Iron |
Steel is a mixture of iron and carbon. Predict how many paper clips a steel core could pick up. Explain your answer.
Use the diagram to explain how an electric bell works.
