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MATHSKIT

Inverse square

You often hear about inverse-square laws in physics. David Swinscoe looks at why the same mathematical relationship applies to many different physical phenomena

There are many inverse-square laws in physics. The electric force between two point charges, the gravitational field strength around a star and the intensity of light from a bulb all demonstrate a form of inverse-square law. But why are they inverse-square, and what does it mean?

In the term inverse-square, ‘inverse’ means ‘dividing by’ and ‘square’ refers to squaring a distance.

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