Electrostatics Question 292

Question: An electric dipole consisting of two opposite charges of $ 2\times {{10}^{-6}}C $ each separated by a distance of $ 3cm $ is placed in an electric field of $ 2\times 10^{5} $ N/C. The maximum torque on the dipole will be [MP PMT 1987]

Options:

A) $ 12\times {{10}^{-1}}Nm $

B) $ 12\times {{10}^{-3}}Nm $

C) $ 24\times {{10}^{-1}}Nm $

D) $ 24\times {{10}^{-3}}Nm $

Show Answer

Answer:

Correct Answer: B

Solution:

Maximum torque = pE $ =\text{ 2}\times \text{1}{{0}^{\text{6}}}\times \text{3}\times \text{1}{{0}^{\text{2}}}\times \text{2}\times \text{1}{{0}^{\text{5}}}=\text{ 12}\times \text{1}{{0}^{\text{3}}}N-m $ .



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