Test your knowledge: Magnets and their invisible pull for K.

📚 Quick Study Guide

• 🧲 Magnets attract certain metals like iron, nickel, and cobalt.
• 🧭 A compass uses a magnetic needle to align with the Earth's magnetic field, indicating direction.
• ➕ Magnets have two poles: a north pole and a south pole. Opposite poles attract, and like poles repel.
• ⚡ Electromagnets are created by passing an electric current through a coil of wire. The strength of an electromagnet can be controlled by varying the current.
• 🌍 The Earth itself has a magnetic field, which protects us from harmful solar radiation.
• 🌡️ Heating a magnet can weaken or destroy its magnetic properties.
• 📏 Magnetic field strength is measured in Tesla (T).

🧪 Practice Quiz

1. Which of the following materials is NOT attracted to a magnet?
   1. Iron
   2. Nickel
   3. Aluminum
   4. Cobalt
2. What happens when you bring two north poles of magnets together?
   1. They attract
   2. They repel
   3. They do nothing
   4. They become stronger
3. What is a device that uses a magnetic needle to indicate direction?
   1. Thermometer
   2. Barometer
   3. Compass
   4. Ruler
4. How can you create an electromagnet?
   1. By heating a magnet
   2. By cooling a magnet
   3. By passing an electric current through a wire coil
   4. By rubbing two magnets together
5. What protects the Earth from harmful solar radiation?
   1. The atmosphere
   2. The Earth's magnetic field
   3. The ozone layer
   4. The Earth's gravity
6. What happens when you heat a magnet significantly?
   1. It becomes stronger
   2. It becomes weaker or loses its magnetism
   3. It becomes an electromagnet
   4. It starts to glow
7. What unit is used to measure magnetic field strength?
   1. Watt
   2. Ampere
   3. Volt
   4. Tesla