How volume charge density can be zero? We see in the Laplace equation (del^2)V=0 only if volume charge density is zero. But electric field intensity(E) is not equal to zero. What can be the physical situations to satisfy this equation.? 
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Let's look at this in 1D: (d^2V)/(dx^2) represents the curvature of V so the del^2 operator gives a version of a 3D curvature. Dan 
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