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A transformer with efficiency 80% works ...

A transformer with efficiency `80%` works at `4 kW` and `100 V`. If the secondary voltage is `200 V`, then the primary and secondary currents are respectively

A

40 A and 16 A

B

16 A and 40 A

C

20 A and 90 A

D

40 A and 20 A

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The correct Answer is:
A
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