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Three charged particles having charges \( q,-2 q \& q \) are placed in a line at points \( (-a, 0),(0,0) \&(a, 0) \)
\( P \) respectively. The expression for electric potential at

WV \( P(r, 0) \) for \( r \gga \) is
(1) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{q a^{2}}{r^{4}} \)
(2) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{2 q a^{2}}{r^{3}} \)
(3) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{4 q a^{2}}{r^{2}} \)
(4) \( \frac{1}{4 \pi \varepsilon_{0}} \frac{8 q a^{2}}{r} \)
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