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| Physics: Faraday's & Lenz's Law?
1. Thinking about Faraday's law, consider what happens as you push the north pole of a magnet into a coil. In which case do you expect the induced current in the coil to be small but not zero? A) When the magnet is pushed into the coil slowly. B) When the magnet is pushed into the coil rapidly. C) At the moment before the magnet is pushed into the coil. D) When the magnet is stationary within the coil. 2. Now let's consider the case where you have one coil inside another. In which case will the induced current in the outer coil be the largest? A) When the applied current in the inner coil is increasing rapidly. B) When the applied current in the inner coil is increased slowly. C) When the applied current in the inner coil is constant. D) When there is no applied current in the inner coil. 3. The lab manual discusses the effect of placing a metal rod into the inner coil. What effect do you expect this to have on the induced current in the outer coil when the applied current in the inner coil changes? A) The induced current will be in the opposite direction than the case without the metal rod. B) The induced current will be larger than without the metal rod. C) The induced current will be smaller than without the metal rod. D) The induced current will be the same as without the metal rod. 4. Figure: http://img98.imageshack.us/img98/6941/bringfp6.jpg A loop is placed in a magnetic field as shown in the figure. If the magnitude of the field is increased, the induced current in the loop will be A) counter clockwise. B) clockwise. C) into the page. D) out of the page. Any help will be greatly appreciated. |
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