Three charges, each $+q,$ are placed at the comers of an isosceles triangle $ABC$ of sides $BC$ and $AC, 2a.$ $D$ and $E$ are the mid-points of $BC$ and $CA.$ The work done in taking a charge $Q$ from $D$ to $E$ is
Three charges, each $+q,$ are placed at the comers of an isosceles triangle $ABC$ of sides $BC$ and $AC, 2a.$ $D$ and $E$ are the mid-points of $BC$ and $CA.$ The work done in taking a charge $Q$ from $D$ to $E$ is
- [AIPMT 2011]
- A
$\;\frac{{3qQ}}{{4\pi {\varepsilon _0}a}}$
- B
$\;\frac{{3qQ}}{{8\pi {\varepsilon _0}a}}$
- C
$\;\frac{{qQ}}{{4\pi {\varepsilon _0}a}}$
- D
zero
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