Four point charges -q, +q, +q and -q are placed on y-axis at y = -2d, y = -d, y = +d and y = +2d, respectively. The magnitude of the electric field E at a point on the x-axis at x = D, with D >> d, will behave as:

\(E \propto \frac{1}{{{D^2}}}\)

\(E \propto \frac{1}{{{D^3}}}\)

\(E \propto \frac{1}{{{D^4}}}\)

Four point charges -q, +q, +q and -q are placed on y-axis at y = -2d,

1.	Four point charges -q, +q, +q and -q are placed on y-axis at y = -2d, y = -d, y = +d and y = +2d, respectively. The magnitude of the electric field E at a point on the x-axis at x = D, with D >> d, will behave as:
A.	\(E \propto \frac{1}{{{D^3}}}\)
B.	\(E \propto \frac{1}{D}\)
C.	\(E \propto \frac{1}{{{D^4}}}\)
D.	\(E \propto \frac{1}{{{D^2}}}\)
Answer» D. \(E \propto \frac{1}{{{D^2}}}\)

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Four point charges -q, +q, +q and -q are placed on y-axis at y = -2d, y = -d, y = +d and y = +2d, respectively. The magnitude of the electric field E at a point on the x-axis at x = D, with D >> d, will behave as:

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