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Three resistance of 15Ω each are connected in delta. The resistance of equivalent star will have a value of

Three resistance of 15Ω each are connected in delta. The resistance of equivalent star will have a value of

(a) 12Ω
(b) 5Ω
(c) 5/3Ω
(d) 45Ω

Ans. (b) 5Ω 

Three resistance of 15Ω each are connected in delta. The resistance of equivalent star will have a value of