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A metal sphere is kept on an insulating ...

A metal sphere is kept on an insulating stand. A negatively charged rod is brought near it , then the sphere is earthed as shown. On removing the earthing, and taking the negatively charges rod away , what will be the nature of charges on the sphere? Give reason for your answer.

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The charges on the sphere is positive charge. The +ve charge is developed on account of electric induction in different steps shown in following figure.
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U-LIKE SERIES-ELECTRIC CHARGES AND FIELDS -VERY SHORT ANSWER QUESTIONS
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