A DNA molecule can be seen as a charged line with a linear charge density of λ. Suppose the DNA molecule has a finite length l. a. Find the electric field at point P, whose perpendicular distance from the center of the molecule is x. b. Suppose that an ion with charge +e is located at the field point P. What are the magnitude and direction of the force that the ion exerts on the molecule?

A DNA molecule can be seen as a charged line with a linear charge density of λ. Suppose the DNA molecule has a finite length l. a. Find the electric field at point P, whose perpendicular distance from the center of the molecule is x. b. Suppose that an ion with charge +e is located at the field point P. What are the magnitude and direction of the force that the ion exerts on the molecule?

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