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Potential at a Point Due to a Dipole

The potential...

Question

The potential due to an electric dipole of dipole moment 2×10^-6 C-m along its its axis at a point 4 m from dipole is

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Solution

r = 4m
P = 2 * 10^-6 c-m
theta = 0 ( axial line)
V = k p cos theta / r² - a² cos² theta
= k P / r² - a²
a<<<r
V = k P / r²
= 1.125 * 10³

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