Solve Transformer Question: V1/V2=N1/N2

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Homework Statement



http://i.imgur.com/DBoKH.png
Problem text with a circuit diagram of an iron-core transformer: a battery marked V on the primary with turns N_P, and a resistor on the secondary with turns N_S, labelled Iron core. Question asks for the current I_S in the resistor, with answer a) I_S = 0 A.



Homework Equations





The Attempt at a Solution



V1/V2=N1/N2, that means there shouldn't be a current. Why it is 0?
Thanks!
 
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  • Problem text and circuit diagram of a transformer: a 12 V battery V on the primary with Np = 200 turns, secondary Ns = 500 turns feeding a resistor R = 40 ohm, iron core, wire resistance zero. Answer shown: a) Is = 0 A.
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Discussion

Look carefully at what is connected to the primary coil.
 

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