Class 10 Science — Chapter 12: Magnetic Effects of Electric Current

What you'll learn

• ▸Oersted's Discovery of Electromagnetism
• ▸Magnetic Field and Field Lines
• ▸Properties of Magnetic Field Lines
• ▸Magnetic Field due to a Straight Current-Carrying Conductor
• ▸Right-Hand Thumb Rule

Chapter Summary

--- PAGE 1 --- CHAPTER 12 Magnetic Effects of Electric Current 1064CH13 In the previous Chapter on 'Electricity' we learnt about the heating effects of electric current. What could be the other effects of electric current? We know that an electric current-carrying wire behaves like a magnet. Let us perform the following Activity to reinforce it. Activity 12.1 * Take a straight thick copper wire and place it between the points X and Y in an electric circuit, as shown in Fig. 12.1. The wire XY is kept perpendicular to the plane of paper. * Horizontally place a small compass near to this copper wire. See the position of its needle. * Pass the current through the circuit by inserting the key into the plug. * Observe the change in the position of the compass needle. Resistor R Long straight conductor (A) X Y A B C D O K + - Figure 12.1 Compass needle is deflected on passing an electric current through a metallic conductor We see that the needle is defl…

Practice Questions from this Chapter

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1. Explain how electromagnets function. Get Solution →
2. Describe what happens when magnets repel. Get Solution →
3. Investigate how a compass finds north. Get Solution →
4. Who discovered in 1820 that a compass needle deflects when an electric current passes through a nearby wire? Get Solution →
5. What is the end of a compass needle that points towards the geographic north called? Get Solution →
6. How do like magnetic poles interact with each other? Get Solution →
7. What do the lines along which iron filings align themselves around a bar magnet represent? Get Solution →
8. What is the region surrounding a magnet where its force can be detected called? Get Solution →

Did you know?

• 💡 Hans Oersted accidentally found electromagnetism during a lecture demonstration in 1820.
• 💡 Our planet Earth acts like a colossal bar magnet, creating its own protective magnetic field.
• 💡 Massive electromagnets in scrapyards can easily lift and move entire cars.
• 💡 Some migrating birds use Earth's magnetic field like an invisible map to navigate.
• 💡 The north pole of a compass needle points to Earth's magnetic south pole.

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