If a and b are constant vectors, (r) = (a r) (b r) is
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If a and b are constant vectors, ϕ(r) = (a × r) · (b × r) is the electrostatic potential in some region of space. Find the electric field E = −∇ϕ and then the charge density ρ = ε0∇ · E associated with this potential.
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