Two pith balls carrying equal charges are suspendedfrom a common point by strings of equal length, theequilibrium separation between them is r. Now thestrings are rigidly clamped at half the height. Theequilibrium separation between the balls now become0孁ㄧ寵尊@㈱諧竊㈱“1驉套1糊爺章載莓■u宿■顱員y/2

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