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Solve 7. Sphere X of mass M and charge + q hangs from a string as shown above. Sphere Y has an equal charge +q

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7. Sphere X of mass M and charge + q hangs from a string as shown above. Sphere Y has an equal charge +q and is fixed in place a distance d directly below sphere X. If sphere X is in equilibrium, the tension in the string is most nearly (A) Mg (B) Mg - kq/d (C) Mg + kq-/d' (D) Mg - kq/P

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