# Physics

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NAME Cyber Intro to Conceptual Physics
PHET Magnetism Lab

Click Play with Sims and on electricity section
Select the simulation “Magnets and Electromagnets.”

Part I: Bar Magnet – Select the Bar Magnet Tab

1. Move the compass slowly along a semicircular path above the bar magnet until you’ve put it on the opposite side of the bar magnet. Describe what happens to the compass needle.

2. What do you suppose the compass needles drawn all over the screen tell you?

3. Move the compass along a semicircular path below the bar magnet until you’ve put it on the opposite side of the bar magnet. Describe what happens to the compass needle.

4. How many complete rotations does the compass needle make when the compass is moved once around the bar magnet?

5. Click on the “Show Field Meter” box to the right. What happens to the magnetic field reading as you move the meter closer to the bar magnet?

6. Click on the “Show planet Earth” box to the right. What type of magnetic pole (north or south) is at the geographical north pole of the Earth (Near Canada)?

PART II: Electromagnet –Select the Electromagnet Tab:

7. Click on the electromagnet tab. Place the compass on the left side of the coil so that the compass center lies along the axis of the coil. (The y-component of the magnetic field is zero along the axis of the coil.) Move the compass along a semicircular path above the coil until you’ve put it on the opposite side of the coil. Describe what happens to the compass needle.

8. Move the compass along a semicircular path below the coil until you’ve put it on the opposite side of the coil. Describe what happens to the compass needle.

9. Use the voltage slider to change the direction of the current and let the compass stabilize. What...

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