Soln9 - Induction - 8B Worksheet Answers 9. Induction 1....

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9. Induction 1. For each of these situations, we will take a ‘positive flux’ through the solenoid to mean a net number of field lines are going through the solenoid pointing to the right . There is initially a positive flux through the solenoid (field lines come out of the north pole and enter the south pole). We will consider a ‘clockwise current’ in the solenoid to be clockwise as looked at from the right - that is, a clockwise current is a current moving from left to right. A clockwise current will create a magnetic field in the solenoid pointing from right to left - it will create a negative flux. A counterclockwise current will creat a field pointing from left to right inside the solenoid - a positive flux. a) Left to Right - As the north pole approaches the solenoid, the flux through the solenoid increases . The clockwise current creates a negative flux to oppose this. b) None - the magnet and solenoid are held fixed, and therefore the flux through the solenoid remains constant. c) Right to Left - As the north pole moves farther from the solenoid, the flux decreases . The counterclockwise current creates a positive flux to oppose this. d) Right to Left - Now the flux through the solenoid starts out negative and gets increasingly negative as the magnet approaches the solenoid. The counterclockwise current creates a positive flux to oppose this. e) Left to Right - The flux through the solenoid starts out negative and gets less negative as the magnet leaves the solenoid. The clockwise current creates a negative flux to oppose this. f) Right to Left - As the solenoid moves farther from the north pole, the flux decreases . The counterclockwise current creates a positive flux to oppose this. g) Left to Right - As the solenoid approaches the north pole, the flux through the solenoid increases . The clockwise current creates a negative flux to oppose this. h) None - the flux through the solenoid doesn’t change.
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This note was uploaded on 10/16/2010 for the course PHYS 8B taught by Professor Catherinebordel during the Spring '10 term at University of California, Berkeley.

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Soln9 - Induction - 8B Worksheet Answers 9. Induction 1....

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