Two initially uncharged identical metal spheres, 1 and 2, are connected by an in

Question

Two initially uncharged identical metal spheres, 1 and 2, are connected by an insulating spring (unstretched length L0 = 1.55 m, spring constant k = 30.0 N/m), as shown in the figure.

Charges +q and

Two initially uncharged identical metal spheres, 1 and 2, are connected by an insulating spring (unstretched length L0 = 1.55 m, spring constant k = 30.0 N/m), as shown in the figure. Charges +q and -q are then placed on the spheres, and the spring contracts to length L = 1.250 m. Recall that the force exerted by a spring is Fs = k?x, where ?x is the change in the spring's length from its equilibrium length. (a) Determine the charge q. (b) If the spring is coated with metal to make it conducting, what is the new length of the spring? {Correct Answer: a. 3.96e-05 C, b. 1.55 m}

Explanation / Answer

Fs = -k?x
Fe = 1 / 4??0 * (+q)(-q) / r^2

set Fe = Fs and solved for q.

q = 3.96*10^-5

b)

coating the spring in metal cause the metal ball to return to L0

ans 1.55m

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