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Course: Science — Third Preparatory
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Science — Third Preparatory

Science — Third Preparatory

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Science — Third Preparatory 2026/2027

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Unit 1 - Force, Motion, Acceleration and Physical Quantities

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Text lesson

Unit 2 — Electricity and Magnetism

Science — Third Preparatory

Unit 2 — Electricity and Magnetism

3.3 Magnetic force on a current-carrying wire

3.3 Magnetic force on a current-carrying wire

  • If a wire carrying current is placed in another magnetic field, such as that of a magnet, what happens?
  • Activity.
  • Two parallel copper rails are connected to a battery and switch.
  • A light cylindrical metal rod lies across the rails, between the poles of a strong U-shaped magnet.
  • When the switch is closed, the rod rolls along the rails.
  • Conclusion a straight conductor carrying current and placed perpendicular to a magnetic field experiences a magnetic force in a definite direction.
  • If the cell connections are reversed (so the current direction reverses), the force and movement reverse.
  • Reversing the magnet’s poles also reverses the direction of motion.
  • This force is the basis of the electric motor.
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