21_InstSolManual_PDF_Part5 - Electromagnetic Induction 21-5...

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21.17. Set Up: Use the right-hand rule to find the direction of the magnetic field due to the long wire at the location of each loop. Lenz’s law says that the magnetic field of the induced current is directed to oppose the change in flux through the circuit. Solve: The magnetic field of the long wire is directed out of the page at C and into the page at A. When the current increases, the magnetic field increases. Therefore, the magnetic field of the induced current in loop C is directed into the page inside the loop, to oppose the increase in flux out of the page due to the current in the long wire. To produce magnetic field in this direction, the induced current in C is clockwise. The magnetic field of the induced current in loop A is directed out of the page inside the loop, to oppose the increase in flux into the page due to the current in the long wire. To produce magnetic field in this direction the induced current in A is counterclockwise.
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