Four charges $q, 2q, -4q$ and $2q$ are placed in order at the four corners of a square of side $b$. The net field at the centre of the square is
Four charges $q, 2q, -4q$ and $2q$ are placed in order at the four corners of a square of side $b$. The net field at the centre of the square is
- A
$\frac{q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- B
$\frac{5q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- C
$\frac{10q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
- D
$\frac{20q}{{2\pi {\varepsilon _0}{b^2}}}$ from $+q$ to $-4q$
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- [AIPMT 2008]
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