3. AS KVA, 200/400 V single-phase O.C. test: 200 V applied to primary; power absorbed 72 W S.C. test: 8V applied to primary circulated F.L. current in short-circuited secondary; power absorbed 80 W [() 96-72 % (i) 94-86 %) Calculate the efficiency at (1) full-load at 0-9 p.f. lagging (ii) half full-load at 0-9 p.f. lagging.

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Coulomb’s Law

Coulomb's law states that the attraction or repulsion force between two charged things is proportional to the product of their charges and inversely proportional to the square of their distance. It has an effect along the line that connects the two-point charges.