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The '''inverse square law''' predicts the intensity of a field at a given distance from a point source.

The '''inverse square law''' predicts the intensity of a field at a given distance from a point source. In general, it applies to 'force-fields' forces such as gravitational, magnetic and electrical. This law states that force gets weaker as you move away from its source by a factor of four (i.e. two squared) when the distance from source is doubled.<ref name="WhomadeGod">{{cite book

Take a [[point source]] that is propagating something ([[light]], [[sound]], [[gravity]], [[electric field]], etc..) out. This

Take a point source that is propagating something ([[light]], [[sound]], [[gravity]], [[electric field]], etc..) out.  

The inverse square law can be derived by looking at the surface area of a [[sphere]] of radius ''r''.  The surface area of a sphere is 4&pi;r².  As the radius increases, the surface area of the sphere goes up with the square of the radius and the intensity of the phenomena will be inversely proportional to the [[surface area]].   

The inverse square law can be derived by looking at the surface area of a [[sphere]] of radius <math>r</math>.  The surface area of a sphere is <math>4 \pi r^2</math> As the radius increases, the surface area of the sphere goes up with the square of the radius and the intensity of the phenomena will be inversely proportional to the [[surface area]].   

With gravity, the inverse square law can be seen in Gm₁m₂ / r².

With gravity, the inverse square law can be seen as:

 

<math>

F= \frac{Gm_1m_2}{r^2}

</math>

== Applications ==

== Applications ==

* [http://hyperphysics.phy-astr.gsu.edu/hbase/Forces/isq.html Inverse Square Law] at Hyperphysics

* [http://hyperphysics.phy-astr.gsu.edu/hbase/Forces/isq.html Inverse Square Law] at Hyperphysics

== Refrences ==

== References ==

<references />

<references />

[[Category: Physics]]

[[Category:Physics]]