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A transformer connected to 220 V mains i...

A transformer connected to 220 V mains is used to light a lamp of rating 100 W and 110 V. If the primary current is 0.5 A, the effeciency of the transformer is (approximately)

A

a. 6

B

b. 35

C

c. 0.5

D

d. 90

Text Solution

Verified by Experts

The correct Answer is:
D
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