Electric Charges and Fields - Result Question 30

[1996]

(a) $E \propto \frac{1}{r}$

(b) $E \propto \frac{1}{r^{2}}$

(c) $E \propto \frac{1}{r^{3}}$

(d) $E \propto \frac{1}{r^{4}}$

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Answer:

Correct Answer: 30. (c)

Solution:

(c) Intensity of electric field due to a Dipole

$E=\frac{p}{4 \pi \varepsilon_0 r^{3}} \sqrt{3 \cos ^{2} \theta+1} \Rightarrow E \propto \frac{1}{r^{3}}$