The ratio of number of turns in primary to secondary coils of transformer is given as 5 : 7. If the current through the primary coil is 3A, then the current through load resistance is

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1 A

4.5 A

2.14 A

1.5 A

answer is C.

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Detailed Solution

npns=57 and ip=3, is=? ⇒isip=npns⇒is3=57⇒is=2.14A

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