D. Electric Current Induced by a magnet in a Coil of Wire Faraday\'s Law of indu

Question

D. Electric Current Induced by a magnet in a Coil of Wire Faraday's Law of induction describes how currents can be created by a changing magnetic flux. In our arrangement with the solenoid, you cannot alter the cross sectional area of our loops of wire, but you can change the strength of the magnetic field. Next, attach the Voltage Sensor from the 850 Interface (in Analog Port A) to the copper solenoid as shown (above right). Make sure you noted which direction the current flows through the wire as it winds around the hollow center. So you know which direction of current will produce a positive deflection of the graph in Capstone and which direction produces a negative deflection. Start Capstone and run "PHYS202 - Electromagnetism" and select the page marked "Magnet and Solenoid". There should be a graph of Voltage vs. time, if not, create one. Start recording. Using the thinner magnet, push the North Pole into the solenoid and pull it out again. Change the speed with which you push and pull the magnet in and out of the solenoid. Reverse the magnet such that you now push and pull the South Pole in and out of the solenoid coil. Which way does the needle deflect in each case? How does the height and width of the peak (i.e. maximum voltage) depend on the speed with which the magnet moves? Make a drawing of this and indicate which direction the current flows as the magnet is moving inward with the North Pole. Either print the graph or copy it to a document you will include in your report. Notate the graph with which way the magnet was moving (which end in or out) and the relative speed (i.e. faster or slower). Repeat the procedure in step 5, but hold the magnet steady and move the coil. What happens now? Explain. Repeat the procedure in step 5 moving the coil and magnet together in the same direction. Do not move them with respect to each other? What happens to the induced current? Why?

Explanation / Answer

If south pole of bar magnet pushed inside solenoid, then needle deflects in clockwise direction.

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