engineering recuitment NPCIL Scientific Assistant Physics Mock Test Physics Electric Potential Potential from the Field
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 between the two charges +q and +q, is
1
Zero
2
\(\dfrac{1}{4\pi \varepsilon_0} \dfrac{2q}{L}(1+\sqrt{5})\)
3
\(\dfrac{1}{4\pi \varepsilon_0} \dfrac{2q}{L}\left(1+ \dfrac{1}{\sqrt{5}}\right)\)
4
\(\dfrac{1}{4\pi \varepsilon_0} \dfrac{2q}{L}\left(1-\dfrac{1}{\sqrt{5}}\right)\)