Two small bar magnets are held with their north poles facing each other.

The repulsive force, $F$, between the magnets can be calculated using the equation:

$$F=\frac{k}{d^2}$$

where:

• $k$ is a constant
• $d$ is the distance between the magnets.

The magnets are positioned 6.0 cm apart.

The repulsive force measured between them is 0.50 N.