Moments, levers and gears

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Question 24
Medium

A student sets up the apparatus shown below to investigate the force between a magnet and an electromagnet.

A light, horizontal rod is balanced on a pivot. A small permanent magnet is attached to the left side of the rod, directly above an electromagnet fixed to the bench.

When a current flows in the electromagnet, it exerts an attractive downward force, FFF, on the permanent magnet.

To balance this force and bring the rod back into horizontal equilibrium, the student hangs an additional weight of 0.080 N on the right side of the rod, at a distance of 10.5 cm from the pivot.

A horizontal wooden rod is supported by a central triangular pivot. On the left side, a small permanent magnet is attached to the rod at a distance of 15.0 cm from the pivot. Directly below this magnet, an electromagnet is fixed to the bench, pulling the magnet downwards with a force F. On the right side, a weight of 0.080 N is hung at a distance of 10.5 cm from the pivot. The system is in equilibrium.

Calculate the size of the force, FFF, between the permanent magnet and the electromagnet.

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Moments, levers and gears Questions

  1. GCSE
  2. /Physics
  3. /Moments, levers and gears