# Essay on Magnetism Lab 19

1319 WordsOct 25, 20126 Pages
Magnetism – Lab 19 Go to http://phet.colorado.edu/simulations/sims.php?sim=Magnets_and_Electromagnets and click on Run Now. Part I: 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. The white lead of the needle faces the South part of the magnet in a perpendicular way. When the needle is facing the center of the magnet, the lead turns to a 90 degree angle, being parallel to the magnet. When the compass faces the North part of the magnet, the needle turns 90 degrees in the same direction until the red lead if facing towards the North of the magnet. 2. What do you suppose the compass…show more content…
16. Play with the voltage slider and describe what happens to the current in the coil and the magnetic field around the coil. As the voltage slider moves to the right, the current flows counter-clockwise going towards the right. The speed of the current increases as the voltage increases. As the voltage slider moves to the left, the current flows clockwise going towards the left. The speed of the current increases as the voltage increases. The magnetic field rotates 180 degrees when the battery slider moves from one side of the battery to the other. 17. What is your guess as to the relationship between the current in the coil and the magnetic field? The current has a positive charge in one side of the coil and it transforms to negative when it gets to the other side of the coil. This charge controls the magnetic field, making the like charges repeal and the opposite charges attract. Part II – Graphing relationships. Field Strength vs. Position 1. Using the Electromagnet simulation, click on “Show Field Meter.” 2. Set the battery voltage to 10V where the positive is on the right of the battery. 3. Along the axis of the coil and at the center of each compass needle starting 5 to the left of the coil, record the value of B. Move one compass needle to the right and record the value of B. Repeat until you’ve completed the table below. NOTE: Be sure to