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9702 · 20.2

Force on a current-carrying conductor

Welcome to the exciting world where electricity meets magnetism! In this lesson, we'll explore how a **current-carrying conductor** experiences a **force** when placed in an external **magnetic field**. This fundamental interaction, known as the **motor effect**, is the principle behind electric motors and countless other technologies. Get ready to understand the physics that makes things move! This pilot aligns with **Senpai Corner** A Level notes (2025–2027) for topic **20.2**.

Need to know

What you need to know

  • A current carrying conductor produces its own magnetic field.
  • When interacting with an external magnetic field, it will experience a force.
  • A current-carrying conductor will only experience a force if the current through it is perpendicular to the direction of the magnetic field lines.
  • Magnetic field strength is measured in magnetic flux density (B).
  • The units for B are in Tesla.

Explanation

Force on a current-carrying conductor

  1. A current carrying conductor produces its own magnetic field.
  2. When interacting with an external magnetic field, it will experience a force.
  3. A current-carrying conductor will only experience a force if the current through it is perpendicular to the direction of the magnetic field lines.
  4. Magnetic field strength is measured in magnetic flux density (B).
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