Question

Two charged balls are connected by an in extensible thread of length 3m. Masses of balls...

Two charged balls are connected by an in extensible thread of length 3m. Masses of balls are 2kg and 1kg, the charges are +20micocoulomb and - 100microcoulomb. What minimum constant external force F must be applied to the ball of mass 1 kg so that the thread does not slack? Neglect friction and gravity.

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