Two Initially Uncharged Identical Metal Spheres 1 and 2 Are $\mu$

question 69

Multiple Choice

Two initially uncharged identical metal spheres 1 and 2 are connected by an insulating spring (unstretched length of 0.68 m) .Charge +6.2 $\mu$ C is placed on the first sphere and -6.2 $\mu$ C on the second sphere,causing the spring to contract to a length of 0.43 m.If someone coats the spring with metal to make it conducting,what is the new length of the spring? 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.

• A)0.25 m
• B)0.43 m
• C)0.56 m
• D)0.68 m
• E)0.75 m

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