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Lenz's Law
30. Induction and Inductance / Lenz's Law / Problem 1

Consider two windings in a transformer wrapped around as shown in the figure. If the terminals p and q are connected through a mechanism to a battery such that current can flow in both directions then determine the direction of current induced in resistor R for the given conditions:
i) increasing flow of current in winding P from p to q. 
ii) decreasing flow of current in winding P from q to p. 
iii) increasing flow of current from q to p in winding P.
Diagram showing transformer windings P and Q with resistor R, illustrating Lenz's Law.

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