Electrostatics Question 205

Question: Three charges are placed at the vertices of an equilateral triangle of side a . The force experienced by the charge placed at the vertex A in a direction normal to BC is [AIIMS 2003]

Options:

A) $ Q^{2}/(4\pi {\varepsilon _{0}}a^{2}) $

B) $ -Q^{2}/(4\pi {\varepsilon _{0}}a^{2}) $

C) Zero

D) $ Q^{2}/(2\pi {\varepsilon _{0}}a^{2}) $

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Answer:

Correct Answer: C

Solution:

$ |\overrightarrow{F _{B}}|=|\overrightarrow{F _{C}}|=k.\frac{Q^{2}}{a^{2}} $ Hence force experienced by the charge at A in the direction normal to BC is zero.



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