1. A positively-charged particle moves horizontally in a uniform downward- directed magnetic field as depicted at right. What is the direction of the force exerted on the particle by the magnetic field at the instant in question? a) Northward b) Southward c) Upward d) Downward e) Eastward  B EAST NORTH f) Westward g) Clockwise as viewed from above. h) Counterclockwise as viewed from above. i) There is no force.

2. A positively-charged particle moves horizontally in a uniform downward- directed magnetic field as depicted above. The particle remains in the magnetic field for the entire time period under consideration here. No force but that of the magnetic field acts on the particle. As time goes by:  B EAST NORTH a) The speed of the particle increases. b) The speed of the particle decreases. c) The speed of the particle stays the same.

3. A positively-charged particle moves horizontally in a uniform downward- directed magnetic field as depicted above. The particle remains in the magnetic field for the entire time period under consideration here. No force but that of the magnetic field acts on the particle. As time goes by:  B EAST NORTH a)The velocity of the particle changes. b)The velocity of the particle stays the same.

4. A positively-charged particle moves horizontally in a uniform downward- directed magnetic field as depicted at right. The particle remains in the magnetic field for the entire time period under consideration here. No force but that of the magnetic field acts on the particle. As time goes by, the kinetic energy of the particle…  B EAST NORTH a) increases. b) decreases. c) stays the same.

5. What can one say about the work being done on a charged particle (with no magnetic dipole moment) by a magnetic field when that charged particle is moving in the magnetic field? a)It is always zero. b)It is zero if the velocity of the particle is collinear with the magnetic field vector at the location of the particle and non-zero otherwise. c)The work done is always greater than zero. d)The work done is always less than zero (negative). e)It is zero if the magnetic field is uniform, but, it can be zero or non-zero if the field is non- uniform.

6. A positively-charged particle moves horizontally in a uniform downward-directed magnetic field as depicted at right. The particle remains in the magnetic field for the entire time period under consideration here. No force but that of the magnetic field acts on the particle. On what kind of path does the particle move as time elapses. a) A circle. b) A parabola. c) A hyperbola. d) A straight line. e) A sinusoidal path.  B NORTH EAST

7. A positively charged particle is moving northward in a downward-directed magnetic field. What is the direction of the force exerted on the particle by the magnetic field? a) Northward b) Southward c) Eastward d) Westward e) Upward f) Downward g) There is no force.

8. A negatively-charged particle is moving upward in an eastward-directed magnetic field. What is the direction of the force exerted on the particle by the magnetic field? a) Northward b) Southward c) Eastward d) Westward e) Upward f) Downward g) There is no force.

9. a) Northward b) Southward c) Eastward d) Westward e) Upward f) Downward g) There is no force. A negatively-charged particle is moving northeastward in an upward-directed magnetic field. What is the direction of the force exerted on the particle by the magnetic field?