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Home  >>  AIMS  >>  Class12  >>  Physics  >>  Electric Charges and Fields
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A free pith ball of mass $8\; g$ carries a positive charge of $5 × 10^{-8} \;C$. What must be the nature and magnitude of charge that should be given to a second pith ball fixed $5cm$ vertically below the former pith ball so that the upper pith ball is stationary?

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$4.356 \times 10^{-7}\;C$ is correct
Hence A is the correct answer.
answered May 29, 2014 by meena.p

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