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Question

The electric potential at a point on the axis of an electric dipole depends on the distance $$r$$ of the point from the dipole as


A
1r
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B
1r2
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C
r
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D
1r3
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Solution

The correct option is D $$\cfrac { 1 }{ { r }^{ 2 } } $$

The expression of electric potential for dipole is , $$V=\dfrac{1}{4\pi\epsilon_0} \dfrac{p\cos\theta}{r^2}$$ where $$p=qd$$ dipole moment.

so,$$ V \propto \dfrac{1}{r^2} $$

Ans:(B)


Physics

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