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Show that electric potential at a point ...

Show that electric potential at a point P, at a distance .r. from a fixed point charge Q, is given by :
`V=(1/(4piepsilon_0))Q/r`

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Evaluate the value `V_(b)-V_(a)=underset(a)overset(b)intvecE.vec(dr).` Here, `E=(1)/(4piin_(0))(q)/(r^(2))`.
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