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Two point charges $-q$ and $+q$ are placed at a distance of $L$, as shown in the figure [add image]. The magnitude of electric field intensity at a distance $R$ ($R\gg L$) varies as
A
$\frac{1}{R^6}$
B
$\frac{1}{R^2}$
C
$\frac{1}{R^3}$
D
$\frac{1}{R^4}$