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Tangent Galvanometer Lab

TangentGalvanometer Lab

Purpose

Examine the magnetic field of the earth.

Materials

computer and internet access

Part 1 Part 1

Objective

How does a compass align itself with a magnetic field?

Faraday's Electromagnetic Lab

Play with a bar magnet and coils to learn about Faraday's law. Move a bar magnet near one or two coils to make a light bulb glow. View the magnetic field lines. A meter shows the direction and magnitude of the current. View the magnetic field lines or use a meter to show the direction and magnitude of the current. You can also play with electromagnets, generators and transformers!

launch phet.colorado.edu
1. Launch the Faraday's Electromagnetic Lab simulation.

2. Click on the Bar Magnet Tab. You should see a bar magnet and compass on the screen.
  • · What color refers to the north pole? ________
  • · What color refers to the south pole? ________
Move the compass around the bar magnetic and observe the deflection of the compass needle
  • What’s the relationship between the tip of the compass needle and the bar magnet?
  • The north pole of the magnet attracts/repels the south pole of the compass.
  • The south pole of the magnet attracts/repels the north pole of the compass.
  • The interaction between the magnetic poles of the compass and magnet is similar to what prior relationship?

3. Scattered all around the magnet are graphics that look identical to the needle of the compass. Place the compass on top of the several of these graphics. How does the compass’ alignment compare with the graphics?


4. Connecting several compasses with a line beginning at one end of the magnet and ending at the other end would give a picture of what the magnetic field on the exterior of a bar magnet looks like. On the graphic below draw the magnetic field around the exterior of the bar magnet. Your magnetic field lines must obey these rules:

  • Magnetic fields lines travel North to South on the exterior of a magnet.
  • Magnetic field lines never cross.
  • The field strength is proportional to the density of the field lines.
User uploaded image
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5. Check the “See Inside Magnet” box.


6. What direction are the magnetic field lines traveling in the interior of the magnet?

7. Draw the electric field around two opposite charges on the diagram to the below.
User uploaded image
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8. The field line drawings look very similar but with one significant difference. What is this significant difference?


9. How does the length of the compass’ needle always align itself with the magnetic field? parallel or perpendicular


10. Draw the magnetic field between two like poles.

User uploaded image
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Part 2 Part 2

Objective

What is the shape of the earth’s magnetic field?

Magnet and Compass

Explore the interactions between a compass and bar magnet. Relate the Earth’s magnetic field to a bar magnet. Vary the magnet's strength, and see how things change both inside and outside. Measure the direction and magnitude of the magnetic field.

launch phet.colorado.edu
1. Launch the Magnet and Compass Simulation.
2. Label geographic north and south on the picture of the earth below.
User uploaded image
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3. Which end of a compass points north: the north pole or south pole. If you are unsure, get a compass from your teacher and experiment.
4. Label magnetic north and south on the picture of the earth to the right. Magnetic north is defined as direction toward which the north-seeking arrow of a compass points and the converse for magnetic south.
5. The Law of Poles states
  • opposite poles attract/repel
  • like poles attract/repel
6. The earth’s magnetic field can be simplified to resemble the magnetic field around a bar magnet. Draw how the “earth’s bar magnet” would be oriented inside the earth.

7. Draw a pair of magnetic field lines. One on each side of the earth.
8. Where is the north pole of the “earth’s bar magnet” located? _____________________________
9. Where is the south pole of the “earth’s bar magnet” located? _____________________________

Part 3 Part 3

Objective

What is the shape of the magnetic field around a current-carrying wire?

Magnetfeld eines geraden stromdurchflossenen Leiters

HTML5-App: Magnetfeld eines geraden stromdurchflossenen Leiters

launch walter-fendt.de
1. Launch the Magnetic Field simulation.
2. What direction is the current flowing? up or down
3. What direction are the electrons flowing? up or down
4. Place the cursor on the base of the compass and click and hold. Observe the deflection of the compass’ needle as you move the compass around the wire.
5. What is the compass needle’s orientation to the wire? parallel or perpendicular
6. Imagine you could hover directly above the end of the wire. What direction is the current flowing in the wire? Let an ´ represent away from you and a · represent towards you.
7. An end view of the taped wire is drawn below. Place an X or 'dot' on the center of the wire to represent the direction of the current..
User uploaded image
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User uploaded image
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8. Draw one magnetic field line about the wire on the end view of the wire to the right.
9. Draw two arrows on the magnetic field line to indicate which way the magnetic field is circulating.
10. The magnetic field about a current-carrying wire weakens as the distance from the wire increases and is given by the equation to the right. Draw two additional magnetic field lines about the wire. Remember the rules for drawing field lines.
David Carroll - Plano West
www.GravityKills.net
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