Ass25 - SOLUTIONS ASSIGNMENT 25 29.15 IDENTIFY and SET UP:The field of the induced current is directed to oppose the change in flux EXECUTE(a The

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SOLUTIONS, ASSIGNMENT 25 29.15. I DENTIFY and S ET U P : The field of the induced current is directed to oppose the change in flux. E XECUTE : (a) The field is into the page and is increasing so the flux is increasing. The field of the induced current is out of the page. To produce field out of the page the induced current is counterclockwise. (b) The field is into the page and is decreasing so the flux is decreasing. The field of the induced current is into the page. To produce field into the page the induced current is clockwise. (c) The field is constant so the flux is constant and there is no induced emf and no induced current. E VALUATE : The direction of the induced current depends on the direction of the external magnetic field and whether the flux due to this field is increasing or decreasing. 29.16. I DENTIFY : By Lenz’s law, the induced current flows to oppose the flux change that caused it. S ET U P and E XECUTE : The magnetic field is outward through the round coil and is decreasing, so the magnetic field due to the induced current must also point outward to oppose this decrease. Therefore the induced current is counterclockwise. E VALUATE : Careful! Lenz’s law does not say that the induced current flows to oppose the magnetic flux. Instead it says that the current flows to oppose the change in flux. 29.17.
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This note was uploaded on 03/11/2010 for the course PHYSICS 1523 taught by Professor Dfs during the Fall '10 term at Dallas.

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Ass25 - SOLUTIONS ASSIGNMENT 25 29.15 IDENTIFY and SET UP:The field of the induced current is directed to oppose the change in flux EXECUTE(a The

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