Posted by **jc** on Sunday, February 12, 2012 at 12:32am.

An uncharged molecule of DNA (deoxyribonucleic acid) is 2.15 m long. The ends of the molecule become singly ionized so that there is a charge of −1.6 × 10^−19C on one end

and +1.6 × 10^−19C on the other. The helical molecule acts like a spring and compresses 1.8% upon becoming charged.

Find the eﬀective spring constant of the

molecule. The value of Coulomb’s constant is 8.98755 × 10^9N m2/C2 and the acceleration due to gravity is 9.8m/s2.

Answer in units of N/m

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