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Magnetic Effects of Electric Current — Question 6

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Question 6

Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?

Answer

The direction of the magnetic field can be determined by applying Fleming's left-hand rule.
The direction of the current is in the opposite direction to the movement of electron beam so it is from the front wall to the back wall. Therefore, the middle finger should point towards the back wall. Also, the direction of force is towards the right, so the thumb points right-side. This gives the direction of fore-finger as downwards Hence, the direction of the magnetic field inside the chamber is downward.

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Science | Chapter 12: Magnetic Effects of Electric CurrentWeb Content

Chapter 12: Magnetic Effects of Electric Current — Quick Revision Guide

Introduction

Electric current creates magnetic fields, and changing magnetic fields can generate electric current. This chapter covers magnetic field patterns, electromagnets, electric motors, generators, and domestic wiring.

Key Points at a Glance

  1. Oersted's experiment: current-carrying wire deflects compass needle — current produces magnetic field
  2. Straight wire: concentric circular field lines; right-hand thumb rule for direction
  3. Solenoid: uniform field inside (like bar magnet); electromagnet = solenoid + soft iron core
  4. Force on current-carrying conductor in magnetic field; Fleming's Left-Hand Rule: F(thumb), B(forefinger), I(middle)
  5. Electric motor: electrical → mechanical energy; coil + magnets + split ring commutator + brushes
  6. Electromagnetic induction (Faraday): changing magnetic flux induces current; relative motion required
  7. Fleming's Right-Hand Rule (generator): B(forefinger), motion(thumb), induced current(middle)
  8. Electric generator: mechanical → electrical energy; AC generator uses slip rings; DC uses split rings
  9. AC advantage: long-distance transmission via transformers (step-up reduces current, minimises I2R loss)
  10. Domestic circuit: live (220V) + neutral + earth; fuse/MCB for overload protection; earthing for safety

Real-World Connections

Electric motors in fans, mixers, vehicles; generators in power stations; MRI uses powerful electromagnets; household circuit safety with fuses, MCBs, and earthing.

Quick Self-Test (5 Questions)

  1. What is the most important concept you learned from this chapter?
  2. Can you write three key equations/formulae from this chapter from memory?
  3. Draw a labelled diagram relevant to this chapter without looking at your notes.
  4. Explain one real-world application of a concept from this chapter.
  5. What is one common mistake students make in this chapter, and how can you avoid it?

Further Study

  • NCERT Textbook Chapter 12
  • NCERT Exemplar Problems
  • Bright Tutorials Detailed Notes: ch12-magnetic-effects.html
  • Bright Tutorials Practice Questions: ch12-magnetic-effects.html
  • Previous Year CBSE Board Papers

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