Two pith balls carrying equal charges are suspended from a common point by strings of equal length, the equilibrium separation between them is r . Now the strings are rigidly clamped at half the height. The equilibrium separation between the balls now become

1. A. ( 1 2 ) 2
2. B. ( r [3] 2 )
3. C. ( 2r 3 )
4. D. ( 2r 3 )

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