1) Two 34 -uC charges are attached to the opposite ends of a spring of spring co

Question

1) Two 34 -uC charges are attached to the opposite ends of a spring of spring constant 150 N/m and equilibrium length 50 cm.

A) by how much does the spring stretch?

2)A 5.0 um strand of DNA carries charge +e per nm of length.

A) Treating it as a charged line, what's the electric field strength 30nm from the DNA, not near either end?

3)A straight wire 14m long carries 27 uC distributed uniformly over its length.

A) what is the line charge density on the wire?

B)Find the electric field strength 19cm from the wire axis, not near either end.

C)Find the electric field strength 460m from the wire.

Explanation / Answer

Let the equilibrium separation =d .. (presumably the natural length of the spring is 0.50m)

Equilibrium occurs when the electrostatic repulsion force (F = kq

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