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Q.

A 100% efficient transformer has 100 turns in the primary and 25 turns in its secondary coil. If the current in the secondary coil is 4 amp, then the current in the primary coil is

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a

1 amp

b

4 amp

c

8 amp

d

16 amp

answer is A.

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Detailed Solution

For 100% efficient transformer Vsis=Vpip⇒VsVp=ipis=NsNp⇒ip4=25100⇒ip=1A
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