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Charges on identical spheres A and B are...

Charges on identical spheres A and B are equal. When the separation between them is 1 m, the repulsion between them is 80 N. Now, another identical and uncharged sphere C is brought in contact with A and then separated. Then, C is brought in contact with B and then separated. What will be the new force between A and B ?

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30 N, repulsion
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KUMAR PRAKASHAN-ELECTRIC CHARGES AND FIELDS -SECTION B NUMERICALS (NUMERICAL FROM TEXTUAL ILLUSTRATIONS)
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