Calculating Magnetic Force (Edexcel GCSE Physics)

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Calculating Magnetic Force on a Current-Carrying Conductor

Higher Tier Only

  • The size of the force acting on a current-carrying wire in a magnetic field can be calculated using the equation:

F = BIL

  • Where:
    • F = force acting on current-carrying wire in newtons (N)
    • B = magnetic flux density (which is the strength of the magnetic field) in tesla (N/A m)
    • I = current flowing through the conductor in amps (A)
    • L = length of the conductor that is in the magnetic field in metres (m)

Force on conductor (2), downloadable AS & A Level Physics revision notes

Force on a current carrying conductor (directed into the page)

Worked example

A 5 cm length of wire is at 90o to the direction of an external magnetic field. When current of 1.5 A flows through the wire it experiences a force of 0.06 N from the motor effect.Calculate the magnetic flux density of the magnet. 

N/A m = T

Examiner Tip

You will only be expected to calculate the force when the wire is perpendicular to the field, so you won't have to worry about angles.

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Ashika

Author: Ashika

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Ashika graduated with a first-class Physics degree from Manchester University and, having worked as a software engineer, focused on Physics education, creating engaging content to help students across all levels. Now an experienced GCSE and A Level Physics and Maths tutor, Ashika helps to grow and improve our Physics resources.