sir in colomb's law questions, i did not understand the solution of the first and the sixth question - Physics - Electric Charges and Fields

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sir in colomb's law questions, i did not understand the solution of
the first and the sixth question sir can u explain???

Vaibhav T. · Accepted Answer

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sir in colomb's law questions, i did not understand the solution of the first and the sixth question.... sir can u explain???