Pathfinder Electrostatics MCQ 22

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India Santosh Sir IITK (Apex Physics)
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Small identical balls are attached at the each end of a spring of force constant k = 200 N/m and relaxed length l = 20 cm. Unknown amount of charges are gradually transferred to the balls in unequal amounts until the spring length becomes twice of its relaxed length. What amount of work must be done by an external agency in slowly compressing the spring back to its relaxed length ?



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