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Fleming's Left-Hand Rule | Physics for Grade 10 PDF Download

Left-Hand Rule

  • The direction of the force (aka the thrust) on a current carrying wire depends on the direction of the current and the direction of the magnetic field
  • All three will be perpendicular to each other
    • This means that sometimes the force could be into and out of the page (in 3D)
  • The direction of the force (or thrust) can be worked out by using Fleming's left-hand rule:

Fleming`s Left-Hand Rule can be used to determine directions of the force, magnetic field and currentFleming's Left-Hand Rule can be used to determine directions of the force, magnetic field and current

Solved Example

Use Fleming’s left-hand rule to show that if the current-carrying wire is placed into the magnetic field between the poles of the magnet, as shown below, there will be a downwards force acting on the wire.Fleming`s Left-Hand Rule | Physics for Grade 10

Step 1: Determine the direction of the magnetic field

  • Start by pointing your First Finger in the direction of the (magnetic) Field.

Step 2: Determine the direction of the current

  • Now rotate your hand around the first finger so that the seCond finger points in the direction of the Current

Step 3: Determine the direction of the force

  • The THumb will now be pointing in the direction of the THrust (the force)
  • Therefore, this will be the direction in which the wire will move

Fleming`s Left-Hand Rule | Physics for Grade 10

Exam Tip

Remember that the magnetic field is always in the direction from North to South and current is always in the direction of a positive terminal to a negative terminal. Feel free to use Fleming's left hand rule in your exam, just don't make it too obvious or distracting for other students!

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