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A transformer is used to light a 100 W and 110 V lamp from a 220 V mains. I

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 amp, the efficiency of the transformer is approximately (a) 50% (b) 90% (c) 10% (d) 30%.

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