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A molecule of DNA (deoxyribonucleic acid) is 2.11 µm long. The ends of the molecule become...

A molecule of DNA (deoxyribonucleic acid) is 2.11 µm long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.96% upon becoming charged. Determine the effective spring constant of the molecule

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Answer #1

In equilibrium net force is zero.

Distance between the charges

Compression in the spring  

Electrostatic force

Spring force

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