Faradays Law Lab

Part 1 - the Faraday PhET

1. Click Here to launch the Faraday's Law PhET. Use only one coil, and I like it better with the field lines off, but that is up to you.

2. When current flows up the front of the coil, trace the wires and notice that the current will flow into the "+" side of the galvanometer. This makes the Galvanometer deflect positively.

3. So a when current flows up the front of the coil, the meter deflects in the positive direction, and when it flows down the front of the coil, the meter deflect negatively.

4. Predict which way the current will flow on the front of the coil when the N pole of the magnet approaches from the right side. Then drag the magnet and make the N pole approach the right side of the coil from the right. A. Which way does the meter actually deflect, positive or negative. Did you predict correctly?

5. Make the magnet approach slowly, and then make it approach quickly. B. What is the difference in the induced voltage?

6. Predict which way the current will flow on the front of the coil when the S pole of the magnet approaches from the left side, and then try it. C. Which way does it actually deflect?

7. Flip the magnet around using the Flippy Magnet button flipper thing so the South pole is on the left side now.

8. Predict which way the current will flow on the front of the coil when the S pole of the magnet recedes from the right side, and then try it. D. Which way does it actually deflect?

9. With the the South pole on the left, predict what the deflections will be when you drag the magnet from right to left all the way through the coil. (There are two different deflections) E. Which ways does it actually deflect? (First it deflects_______ then it deflects_______)

10. If you got #9 incorrect, try a different traverse all the way through the coil. Predict, then try. Flip the magnet around, go left to right, etc.

Part 2 - Watch these videos:

Answer these questions:

1. Which graph of EMF goes with video A. Why do you think so? (Talk about the speed the magnet moves into and out of the coil, and which pole of the magnet is goes in first)

2. Which graph of EMF goes with video B. Why do you think so?

3. Which graph of EMF goes with video C. Why do you think so?

4. Which graph of EMF goes with video D. Why do you think so?

5. When the South Pole of the magnet in the video approaches the coil is the EMF positive or negative?

6. When the South Pole of the magnet in the video recedes from the coil is the EMF positive or negative?

7. When the North Pole of the magnet in the video approaches the coil is the EMF positive or negative?

8. When the North Pole of the magnet in the video recedes from the coil is the EMF positive or negative?

9. When the EMF is positive, is current flowing up or down the front of the coil? (The part closest to the camera)