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Understanding Electrostatic Potential

The intensity...

Question

The intensity of electric field E due to charge Q at distance r.

E \propto r

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E \propto \frac{1}{r^{2}}

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E \propto \frac{1}{r}

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E \propto \frac{1}{r^{3}}

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Solution

The correct option is D $E \propto \frac{1}{r^{2}}$
According to Coulomb's Law:
$E = k \frac{Q}{r^{2}}$
where E is electric field, q is charge at a distance r and k is a constant. Therefore,
$E \propto \frac{1}{r^{2}}$

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