Class 12 Physics — Chapter 6: ELECTROMAGNETIC INDUCTION

What you'll learn

• ▸Electromagnetic Induction (EMI)
• ▸Faraday's and Henry's Experiments
• ▸Magnetic Flux (Φ_B)
• ▸Faraday's Law of Induction
• ▸Induced EMF in a Coil with N Turns
• ▸Methods of Inducing EMF

Chapter Summary

--- PAGE 1 --- Chapter Six ELECTROMAGNETIC INDUCTION 6.1 INTRODUCTION Electricity and magnetism were considered separate and unrelated phenomena for a long time. In the early decades of the nineteenth century, experiments on electric current by Oersted, Ampere and a few others established the fact that electricity and magnetism are inter-related. They found that moving electric charges produce magnetic fields. For example, an electric current deflects a magnetic compass needle placed in its vicinity. This naturally raises the questions like: Is the converse effect possible? Can moving magnets produce electric currents? Does the nature permit such a relation between electricity and magnetism? The answer is resounding yes! The experiments of Michael Faraday in England and Joseph Henry in USA, conducted around 1830, demonstrated conclusively that electric currents were induced in closed coils when subjected to changing magnetic fields. In this chapter, we will study the phenomena associ…

Practice Questions from this Chapter

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1. Explain how generators make electricity. Get Solution →
2. Show a real-world example of induction. Get Solution →
3. Define magnetic flux in simple terms. Get Solution →
4. Who are the two scientists credited with independently discovering electromagnetic induction around 1830? Get Solution →
5. What is the name of the phenomenon in which an electric current is generated by varying magnetic fields? Get Solution →
6. In Faraday's experiments, what is required to induce a current in a wire loop using a bar magnet? Get Solution →
7. What is the SI unit of magnetic flux? Get Solution →
8. According to the text, magnetic flux is what type of quantity? Get Solution →

Did you know?

• 💡 Some migrating birds and sea turtles can sense Earth's magnetic field to navigate.
• 💡 Michael Faraday, a key figure in electromagnetism, began his career as a bookbinder's apprentice.
• 💡 Electric eels can produce up to 600 volts of electricity to stun their prey.
• 💡 Giant magnets in MRI machines help doctors see inside your body without cutting it open.
• 💡 Electricity travels at nearly the speed of light through wires, around 300,000 kilometers per second.

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