21_InstSolManual_PDF_Part4 - 21-4 Chapter 21 21.14 Set Up...

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21.14. Set Up: The field of the induced current is directed to oppose the change in flux in coil B. When S is closed the magnetic field of coil A is directed to the right. The field of A is stronger at points closer to A. The field of A is proportional to the current in A. Solve: (a) The flux due to field directed to the right decreases (goes to zero) when S is opened. The field due to the induced current is to the right inside of coil B. To produce field in this direction, the induced current passes through the resistor from a to b. (b) The flux through coil B due to the field of A increases, so the field due to the induced current is to the left inside of coil B. To produce field in this direction, the induced current passes through the resistor from b to a. (c) Decreasing R causes the current in coil A to increase, so the field of A increases. The flux through coil B due to the field of A increases, so the field due to the induced current is to the left inside of coil B. To produce field in this direc-
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