Imagine that an uncharged pith ball is brought into the electrostatic field of a charged rod. the side of the pith ball closest to the negatively charged end of the rod will
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When the uncharged pith ball is brought close to a negatively charged rod :
The pith ball is charged by induction.
The charges induced are opposite to the charges on the rod.
In this case since the rod is negatively charged, the pith ball becomes induced with positive charges.
Therefore the pith ball becomes positively charged.
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