Very stuck on electrostatics question

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latentcorpse
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State Gauss' Law

A spherical volume carries a uniform charge density [itex]\rho_0[/itex]. A particle of mass m and charge -q is placed inside the sphere at radial distance r. (This additional charge does not distort the field arising from the [itex]\rho_0[/itex] charge density.) Show that the particle oscillates harmonically and find its' oscillation frequency.

don't really know what to do here.

obviously gauss' law is [itex]\nabla \cdot \vec{E}=\frac{\rho_0}{\epsilon}[/itex]
and the lorentz force will probably come into play, [itex]F=\int_V \rho_0 \vec{E} dV[/itex] seeing as ther's no magnetic field.

but i can't put it together.

thanks guys.
 
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What is the equation of motion for a harmonic oscillator? Compare the equation of motion of a harmonic oscillator to the equation of motion you have for this given problem. It should strike you as very similar.
 
yeah. just got it there actually. thanks though. took me flippin ages!