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- May 14, 2014
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The question reads:
883. In which direction will the current in the ring be generated when the magnet moves completely through the ring?
A. clockwise then counter clockwise
B. counter clockwise then clockwise
C. clockwise only
D. counterclockwise only
B is correct. Use the right hand rule. Choose a point on the ring; let's say the top off the ring. Now let's move the ring toward the magnet instead of the magnet toward the ring because it is easier to visualize. Since relative movement is what counts in induction, moving the ring instead of the magnet won't change the results. Assume positive charge in the ring at the chosen point. As the ring moves toward the magnet, the charge moves through a magnetic field directed up the page. The fingers of our right hand point up the page, our thumb points in the direction of the moving charge, and we push with our palm. This indicates a current into the page at the top of the ring or a clockwise current. But as we move the ring past the center ofthe magnet and the magnetic field lines go into the south pole, the direction of the magnetic field reverses and the current reverses.
Can someone please explain this to me? I am trying to use the right hand rule but cannot figure out what direction I should be putting everything.
883. In which direction will the current in the ring be generated when the magnet moves completely through the ring?
A. clockwise then counter clockwise
B. counter clockwise then clockwise
C. clockwise only
D. counterclockwise only
B is correct. Use the right hand rule. Choose a point on the ring; let's say the top off the ring. Now let's move the ring toward the magnet instead of the magnet toward the ring because it is easier to visualize. Since relative movement is what counts in induction, moving the ring instead of the magnet won't change the results. Assume positive charge in the ring at the chosen point. As the ring moves toward the magnet, the charge moves through a magnetic field directed up the page. The fingers of our right hand point up the page, our thumb points in the direction of the moving charge, and we push with our palm. This indicates a current into the page at the top of the ring or a clockwise current. But as we move the ring past the center ofthe magnet and the magnetic field lines go into the south pole, the direction of the magnetic field reverses and the current reverses.
Can someone please explain this to me? I am trying to use the right hand rule but cannot figure out what direction I should be putting everything.
