Magnetic Fields Around Conductors

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Questions and Answers

What happens to the compass needle when the current is not flowing through the wire?

  • The needle rotates around the wire in a circular motion.
  • The needle shows deflection to the west.
  • The needle points towards the east direction.
  • The needle aligns with the earth's magnetic field pointing north-south. (correct)

When the current flows from A to B in the wire, what direction does the north pole of the compass needle deflect?

  • Directly downwards
  • Towards the east
  • Directly upwards
  • Towards the west (correct)

What occurs when the connections at the terminals of the battery are reversed?

  • The compass needle deflects towards the west.
  • The compass needle deflects towards the east. (correct)
  • The compass needle shows no deflection.
  • The compass needle points directly north.

Which component allows you to control the amount of current flowing through the wire in this experiment?

<p>The rheostat (A)</p> Signup and view all the answers

What observation is made when the key is closed and the current is actively flowing?

<p>The compass needle's north pole deflects to the west. (B)</p> Signup and view all the answers

Flashcards

Compass needle alignment (no current)

The compass needle aligns with the Earth's magnetic field (N-S) when there's no current flowing.

Compass deflection (current flows)

When current flows through the wire, the compass needle deflects, indicating the presence of a magnetic field around the wire.

Compass deflection direction

The direction of the compass needle deflection depends on the direction of the current flowing through the wire.

Magnetic field shape

The magnetic field around a current-carrying wire forms concentric circles around the wire.

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Electromagnetism

This experiment demonstrates the fundamental relationship between electricity and magnetism, showing that current creates a magnetic field.

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Study Notes

Demonstrating Magnetic Fields Around Current-Carrying Conductors

  • A compass needle can be used to demonstrate the magnetic field around a current-carrying conductor.
  • When no current flows (key is open), the compass needle aligns with Earth's magnetic field, parallel to the wire.
  • When current flows (key is closed) in a specific direction (A to B), the north pole of the compass needle deflects (towards the west).
  • Reversing the current direction (reversing connections) reverses the deflection (north pole towards east).

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