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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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Four charges $+q, +q, +q,$ and $−q$ are respectively placed at the four corners (A, B, C, and D) of a square of side ‘a’ as shown in the given figure.The magnitude of the electric field at the centre of square is

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The magnitude of the electric field at the centre of square is $ \large\frac{1}{4 \pi \in _0} \frac{4 \sqrt q}{a^2}$
Hence B is the correct answer.
answered Jun 2, 2014 by meena.p
 
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