Charges $-q,\, q,\,q$ are placed at the vertices $A$, $B$, $C$ respectively of an equilateral triangle of side $'a'$ as shown in the figure. If charge $-q$ is released keeping remaining two charges fixed, then the kinetic energy of charge $(-q)$ at the instant when it passes through the mid point $M$ of side $BC$ is
Charges $-q,\, q,\,q$ are placed at the vertices $A$, $B$, $C$ respectively of an equilateral triangle of side $'a'$ as shown in the figure. If charge $-q$ is released keeping remaining two charges fixed, then the kinetic energy of charge $(-q)$ at the instant when it passes through the mid point $M$ of side $BC$ is
- A
$\frac{{{q^2}}}{{8\pi { \in _0}a}}$
- B
$\frac{{{q^2}}}{{4\pi { \in _0}a}}$
- C
$\frac{{{q^2}}}{{2\pi { \in _0}a}}$
- D
$\frac{{{q^2}}}{{\pi { \in _0}a}}$
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