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Electric field due to a non-conducting ...

Electric field due to a non-conducting sphere at R/4 is same as some external point r (r > R). Find the ratio of electric potential (w.r.t infinity) at internal and external point. (R is radius of sphere, Q is charge on it.) 1. 47/32 2. 47/16 3. 31/32 4. 49/16

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