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A simple model of a DNA molecule in aqueous solution is modeled by an infinitely long charged rod with negative linear charge density -

A simple model of a DNA molecule in aqueous solution is modeled by an infinitely long charged rod with negative linear charge density -λ surrounded by a cloud of positive ions with uniform charge density?.

a. Find the electric field as a function of the radial distance r from the charged.= 2πε0r1(−λ+ρπr2)r

b. At what location would another molecule no longer feel the electrostatic effects of DNA. Give your answer in term of λ and ρ .

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