COULOMB'S LAW: Two free point charges +Q and +4Q are at distance L apart. A third charge is so
https://youtu.be/5wOeUp1FwAA
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Two identical metallic blocks resting on a frictionless horizontal surface are connected by a light metallic spring having a spring constant k and an unstretched length L0 as shown in the figure. A total charge of Q is slowly placed on the system, causing the spring to stretch to an equilibrium length L as shown in figure.
https://www.youtube.com/watch?v=wYiZIctlqzo
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