A transformer has an efficiency of 92.5%. the ratio number of turns in the primary coil to that in the secondary coil is 128 : 45. If the current passing through the secondary coil is 9.0A, calculate the current passing through the primary-coil.
A.
2.93A
B.
3.16A
C.
3.42A
D.
25.60A
E.
27.68A
Correct Answer: Option C
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