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please explain how to find the direction of the work done by the external medium when we try to find the value of potential because in ncert its written below equation 2.6 that for delta r dash to be negative work done is positive and its very confusing. Please help.

please explain how to find the direction of the work done by the external medium when we try to find the value of potential because in ncert its written below equation 2.6 that for delta r dash to be negative work done is positive and its very confusing. Please help.
 

Grade:12

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