Question

Describe how you could measure the magnetic force due to an external uniform magnetic field using magnets and a scale. (Hint: The experiment can be designed to that the magnets experience the magnetic force in the same direction as the force of gravity.

Answer 1

In given external magnetic field taking a magnet close to it. Now according to our magnet's polarity it will be attracted or repelled. Suppose our magnet is of same polarity as external field, so it will be repelled, now varying the distance with the non-magnetic weight scale touched to magnet. As the repulsion works,our magnet will be repelled by some force and our weight scale is touched to magnet and due to repulsion weight scale will show some reading. This reading is the repulsive force(we will not let the scale to move or hold it at same place). In the case of opposite polarity of magnet we can use a spring weight scale, as magnet is being attracted the spring of scale will show reading and this reading or measurement is attractive force.