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The efficiency of an ideal transformer i...

The efficiency of an ideal transformer is

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Assertion : A laminated core is used in transformers to increase eddy currents. Reason : The efficiency of a transformer increases with increase in eddy currents.

Assertion : A laminated core is used in transformers to increase eddy currents. Reason : The efficiency of a transformer increases with increase in eddy currents.

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 :

In a non -ideal transformer the primary and secondary voltages and currents are V_1,I_1 and V_2,I_2 respectively. The efficiency of the transformer is