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Question1
A molecule of DNA (deoxyribonucleic acid) is 2.35 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 1.01 percent upon becoming charged. Determine the efficient spring constant of the molecule.
Question2
Two point charges, = -5.3 and = 1.6 are located between two oppositely charged parallel plates. The two charges are separated by a distance of = 0.35. Assume that the electric field produced by the charged plates is uniform and equal to = 7.3×104.
Question3
A spelunker is surveying a cave. She follows a passage 180.0 m straight west, then 210.0 m in a direction southeast then 90.0 m at 30.0 wests of north. After a fourth unmeasured displacement, she finds herself back where she started. Establish the magnitude and direction of the fourth displacement.
A sphere of radius R is uniformly charged to a total charge of Q. It is made to spin about an axis that passes through its center with an angular speed ω. Find the magnitude of the resulting magnetic field at the center of the sphere.
A resistor is in the shape of a cube, with each side of resistance R . Find the equivalent resistance between any two of its adjacent corners.
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