Physics · 2011
NEET 2011 · Prelims · Code A · Q16
Four electric charges + q, + q, - q and - q are placed at the corners of a square of side 2L (see figure). The electric potential at point A, midway…
Four electric charges $\displaystyle +\mathrm{q}$, $\displaystyle +\mathrm{q}$, $\displaystyle -\mathrm{q}$ and $\displaystyle -\mathrm{q}$ are placed at the corners of a square of side 2L (see figure). The electric potential at point A, midway between the two charges $\displaystyle +\mathrm{q}$ and $\displaystyle +\mathrm{q}$, is :
Official answer
(4)
$\displaystyle \frac{1}{4 \pi \epsilon_{\mathrm{o}}} \frac{2 \mathrm{q}}{\mathrm{L}}\left(1-\frac{1}{\sqrt{5}}\right)$
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