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Q.

In a step-up transformer the turn ratio is 1:10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current

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a

50 V, 1 amp

b

10 V, 5 amp

c

25 V, 4 amp

d

20 V, 2 amp

answer is B.

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Detailed Solution

Np:Ns=1:10 and Vs=0.5×200=100VVsVp=NsNp⇒100Vp=101⇒Vp=10Vipis=NsNp⇒ip0.5=101,ip=5amp
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