Edexcel IGCSE Physics 复习笔记 6.1.10 Magnetic Force on a Charge

• When a current-carrying wire is placed in a magnetic field, it will experience a force if the wire is perpendicular
  • This is because the magnetic field exerts a force on each individual electron flowing through the wire

   

• Therefore, when a charged particle passes through a magnetic field, the field can exert a force on the particle, causing it to deflect
  • The force is always at 90 degrees to both the direction of travel and the magnetic field lines
  • The direction can be worked out by using Fleming's left-hand rule

   

The electron experiences a force upwards when it travels through the magnetic field between the two poles

• If the particle is travelling perpendicular to the field lines:
  • It will experience the maximum force

   

• If the particle is travelling parallel to the field lines:
  • It will experience no force

   

• If the particle is travelling at an angle to the field lines:
  • It will experience a small force