1) In the expression F = q v sin(θ) B which vectors are always perpendicular to each other and which may be at any arbitrary angle?

2) How can we determine whether the forces between two magnets are not merely some form of electrostatic force? Describe experiments/experiences that clearly illustrate how magnetism is distinct from electrostatic forces.

3) If a moving electron is deflected as it passes through a region of space might there be a magnetic field in that region? Might there be an electric field? Might there be both?

4) If the velocity of an electron is unchanged as it passes through a region of space might there be a magnetic field in that region? Might there be an electric field? Might there be both?

5) If the speed of an electron is unchanged as it passes through a region of space might there be a magnetic field in that region? Might there be an electric field? Might there be both?

6) The four particles below follow the trajectories shown in the presence of a B field pointing into the paper. What can you say about the charge of each particle?

7) An electron in a TV is travelling at 7.2^.10⁶ m/s in a magnetic field of 83 mT. What is the minimum force the electron could feel in this field? What is the maximum force the electron could feel in this field?

8) Take a location on the earth where the magnetic field of the earth is horizontal and has a magnitude of 2.5^.10^-5 T and is pointed straight North. If a proton is zipping along due East how fast must it be going if the magnetic force exactly balances the gravitational force?

9) What uniform field must be set up in space so that a proton moving at 1.0^.10⁷ m/s will move in a circle the size of the earth's equator?

10) An electron with 2.4 keV of kinetic energy is headed directly towards a plate 1.2 m away. What is the magnitude of the B field that will just prevent the electron from hitting the plate?

11) A proton is travelling simultaneously through an E field of 1.5 kV/m and a B field of 0.4 T. These fields are arranged in just such a way that the electric force cancels the magnetic force. Draw the E, B, and v vectors. What is the speed of the electron? Gravity does not play a role in this problem.