For calculating magnetic fields, what are the advantages and disadvantages of the Biot-Savart law?
Describe the magnetic field due to the current in two wires connected to the two terminals of a source of emf and twisted tightly around each other.
Identical currents are carried in two circular loops; however, one loop has twice the diameter as the other loop. Compare the magnetic fields created by the loops at the center of each loop.
How would you orient two long, straight, current-carrying wires so that there is no net magnetic force between them? (Hint: What orientation would lead to one wire not experiencing a magnetic field from the other?)
Compare and contrast the electric field of an infinite line of charge and the magnetic field of an infinite line of current.
Is the magnetic field of a current loop uniform?
Two concentric circular wires with different diameters carry currents in the same direction. Describe the force on the inner wire.
Is Ampère’s law valid for all closed paths? Why isn’t it normally useful for calculating a magnetic field?
Is the magnetic field inside a toroid completely uniform? Almost uniform?
Explain why inside a long, hollow copper pipe that is carrying an electric current parallel to the axis. Is outside the pipe?
A diamagnetic material is brought close to a permanent magnet. What happens to the material?
If you cut a bar magnet into two pieces, will you end up with one magnet with an isolated north pole and another magnet with an isolated south pole? Explain your answer.