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The energy density u is plotted against ...

The energy density u is plotted against the distance r from the centre of a spherical charge distribution on a log-log scale. Find the magnitude of slope of obtained straight line.

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`u=1/2 in_(0) E^(2)=1/2 in_(0)(q/(4pi in_(0) r^(2)))^(2)=q^(2)/(32 pi^(2) in_(0) r^(4))rArr log u= log (q^(2)/(32 pi^(2) in_(0) r^(4)))=log k-4 log r`
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