Question 7 ā€” Compass near the coil - Questions at the end of the chapter - Chapter 4 Class 8 - Electricity: Magnetic & Heating Effects(Curiosity)

Last updated at July 13, 2026 by

Q 7
Question

Look at Fig. 4.4a. If the compass near the coil deflects: (i) Draw an arrow to show the path of the current. (ii) Explain why the compass needle moves when current flows. (iii) Predict what happens to the deflection if you reverse the battery terminals.

šŸ”— Concept: 4.1.1 Electromagnets

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The current makes a magnetic field; reversing the terminals reverses the deflection.

Explanation

  • (i) The current flows from the positive terminal, through the coil, back to the negative terminal.
  • (ii) The current makes a magnetic field around the coil, which moves the compass needle.
  • (iii) Reversing the terminals reverses the current, so the needle deflects the other way.
Current makes the field; its direction sets the deflection direction.
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