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What is the equation for the radius in electric field strength equation

Hi what is the formula for the radius in the equation E=Q/4piεr^2(Q/r^2) ?
The formula for electric field strength is E=Q4πϵr2 E = \dfrac{Q}{4 \pi \epsilon r^2}

r refers to the distance from the centre of the (point) charge to the point

rearranging for r, we have r=Q4πϵE r = \sqrt{ \dfrac{Q}{4 \pi \epsilon E} }
thanks

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