Week 1

Read: Iron, Loadstones, and Terrestrial Magnetism (Chap. 1) and The Life and Death of a Magnet (Chap. 2)

PHY 202 Lecture: Scalars, vectors, vector algebra, application: lorentz force law
Quiz: First day of class, so no quiz!

Homework:
  1. Iron, loadstones and the Earth (ASGv3, Ex.1.1),
  2. Loadstone logic (ASGv3, Ex. 1.2),
  3. Compass and Terrella (ASGv3, Ex. 2.1),
  4. Curie Temperature (ASGv3, Ex. 2.2)
  5. PHY 202: Vector addition (ASGv3Ex. A.2)

Laboratory: Magnetism Laboratory (ASGv3, Ex. 1.3). In this laboratory exercise, we will carry out qualitative and quantitative experiments involving loadstones, ceramic (ferrite) magnets, and rare earth (neodymium) magnets. In particular, you should do the following exercises:
  1. Identify the north and south faces of each of your magnets by calibrating it against the earth. What is your procedure? Use bar magnets, ceramic magnets, and lodestones. Consider: are the north and south faces of a magnet always on opposite ends of the magnet? Can a magnet have more than one North Pole?
  2. Measure the attractive force between magnets using a calibrated force sensor. How does the attractive (or repulsive) force depend on the distance between the magnets? Be sure to make a clear plot of force (vertical axis) versus separation (horizontal axis). Use Logger Pro to do a power-law fit to your data. Is this consistent with what you would expect? Hint: look up how the attraction between two (perfect) dipole magnets depends on the distance between them. Are yours perfect dipole magnets?
  3. Can magnetic forces be shielded? In particular, study how intervening materials such as plastic, wood, aluminum and iron affect the attractive force between two magnets. Hint: when doing this exercise, measure the attraction between two very nearby magnets and alternatively slide an obstacle between them and pull it out. Do you notice a change in force?

Chapter 1 (5 videos):











Chapter 2 (4 videos):











Physics 2