Two Initially Uncharged Identical Metal Spheres Are Connected by an Insulating

question 17

Multiple Choice

Two initially uncharged identical metal spheres are connected by an insulating spring (unstretched length 0.75 m) .Charge +2q is placed on the first sphere and -q on the second sphere,causing the spring to contract to a length of 0.54 m.Recall that the force exerted by a spring is k $\Delta$ x,where $\Delta$ x is the change in the spring's length from its unstretched/uncompressed length and k is the spring constant.If the charge q = 2.06 * 10^-5 C,what is the spring constant?

• A)125 N/m
• B)187 N/m
• C)35.0 N/m
• D)58.3 N/m
• E)142 N/m

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