MagnetRadius:

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   Computes the magnetic radius from the mass, density, stess,and magnetic
   field.

   Type Magnet radius for a demo.
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   Form:
   rM = MagnetRadius( mM, rhoM, sigmaM, bM )
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   ------
   Inputs
   ------
   mM            (1,:)        Mass (kg)
   rhoM          (1,1)        Density (m^-3)
   sigmaM        (1,1)        Stress (N/m)
   bM            (1,1)        Magnetic field (T)

   -------
   Outputs
   -------
   rM            (1,:)        Radius (m)

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   Refernces:  Schaffer, M.J., "Considerations for Steady-State FRC-Based
               Fusion Space Propulsion", GA-A23579, December 2000.
               General Atomics, San Diego, CA
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Children:

Common: Graphics/Plot2D