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[" A transformer is used to light "(100-...

[" A transformer is used to light "(100-110)W" lamp from "220V],[" mains.If the main current is "0.5A" ,the efficiency of the "],[" transformer is "],[[" (a) "95%," [KCET "2015]],[" (c) "90%," (b) "99^(@)6]]

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