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MHT CET Physics question

PhysicsAlternating CurrentMHT CET

A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A, the efficiency of the transformer is approximately [MHTCET 2015]

Answer: (C)

Solution

Input power W and output W, so

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Question ID VK-082250