Beta:

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   Compute the ratio of magnetic field and pressure.

   Type Beta for a demo.
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   Form:
   beta = Beta( b, p )
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   ------
   Inputs
   ------
   b           (:)    Magnetic field (T)
   pPlas       (:)   Pressure of plasma (N/m^2)

   -------
   Outputs
   -------
   beta	    (:)   Beta

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	References: Glasstone, S., and R. H. Lovberg, Controlled Thermonuclear 
               Reactions, Krieger, 1975, pp. 53
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Children:

Common: Graphics/Plot2D
FusionPropulsion: PlasmaPhysics/PlasmaConstant