Question.3939 - Go to the University of Colorado Boulder website and select the Faradays Law simulation (https://phet.colorado.edu/en/simulation/faradays-law). You can activate it right in the window by clicking on it. You can also download to your computer if you wish. Try moving the magnet around. What happens? Is a current induced? Select the field lines option. Move the magnet so the 3rd field line at the bottom is the only one going through the coil back and forth. Now have the first two at the bottom going through. What effect does more field lines have on voltage induced? SLOWLY move the whole magnet through the wire loop from the right (stopping when the north pole just passes outside). Then QUICKLY move it from the right (again, stopping when the north pole just passes outside). Which induced a greater voltage? From your answers to #2 and #3, what two factors determine the induced voltage? The positive and negative voltages describe the currents direction (negative/left or positive/right). Bring the north pole toward the coil from the right. What direction does the voltage go? Now pull the magnet away from the coil. What is the direction now? Flip the directions of the poles (bottom button). Bring the south pole to the coil. What is the induced direction? Pull the magnet away and note the direction this time. Of the motions from #5 and #6, which ones gave the same results? Why do different orientations and motions of the magnet affect the voltage and current directions? (Hint: consider how magnetic field and current are connected.) There is no power source in this simulation so you are creating one with the magnet and coil. If you move the magnet back and forth quickly through the coil (or quickly keep clicking on the button flipping the poles) you simulate another power source. Which is an example of DC power and which is AC? Set the magnet with the north pole facing left and add a second coil. Bring the magnet back and forth through the small coil. Do the same for the large coil. Which induces a greater voltage? So in addition to your answer in #4, what ELSE effects induced voltage? Suppose you have two circuits near each other with light bulbs and no power sources. One has a large coil and the other has a small. You want to create a small current in one and a large current in the other. For both you also want to continuously keep the bulbs lit. Using a magnet, how an you accomplish this?
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