Magnetism and Electromagnetism unit test
A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.
Terminal velocity of a falling loop
Applying Lenz's law to a falling magnet
Zero force parallel to the field
Negative charges: solve then flip
Domains and ferromagnetism
No magnetic monopoles
Magnetic field of a wire
Solenoid field
Charged particle in a magnetic field
Force on a current-carrying wire
Determining the field direction around a wire
The rod-on-rails chain
Short answer 1. Define or explain: The Fv against ε²/R check
3 ptsShort answer 2. Define or explain: Radius of circular motion
3 ptsShort answer 3. Define or explain: Why magnetic monopoles do not appear
3 ptsShort answer 4. Define or explain: Force on a moving charge
3 ptsFree response
10 ptsA straight wire segment of length L carries a current I to the right. The wire is placed in a uniform magnetic field of magnitude B directed into the page, perpendicular to the wire.
A(i). Indicate the direction of the magnetic force exerted on the wire. A(ii). Indicate the direction of the magnetic force that would be exerted on a positive charge moving to the right at the same location.
B. Derive an expression for the magnitude of the magnetic force exerted on the wire, in terms of B, I, L and physical constants.
C. A particle of mass m and charge +q enters the same field region moving perpendicular to the field with speed v. Derive an expression for the radius of its circular path.
D. A second particle with the same charge and speed but twice the mass enters the same region. Indicate whether its radius is greater than, less than, or equal to that of the first particle, and justify your answer using your expression from part C.