The figure below shows two coils close to each other. Notice that they are wrapped in different ways. How do I know which of following alternatives is right and why?
a) When the power switch S is closed, current flows through the conductor from A to B.
b) When the power switch S is closed, current flows through the conductor from B to A.
c) Power in lead AB only occurs when power switch S is closed or opened.
d) Power in conductor AB is running continuously as long as S is closed.
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