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 oftravel and the magnetic field lines
  • The direction can be worked out by using Fleming's left-hand rule
• • Ift he particle is travelling perpendicular to the field lines: It will experience the maximum force
  • Ifthe particle is travelling parallel to the field lines: It will experience no force
  • Ifthe particle is travelling at an angle to the field lines: It will experience a small force
• Remember that the direction of current flow in Fleming's Left-Hand Rule is from positive to negative. This means it is in the opposite direction to the direction of travel of an electron (which is negatively charged)
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