A current-carrying wire is laid on a table, oriented North-South. Electrons in the wire are flowing North. (a) What is the direction of the magnetic field at a location directly underneath the wire,...

A current-carrying wire is laid on a table, oriented North-South. Electrons in the wire are flowing North. (a) What is the

direction of the magnetic field at a location directly underneath the wire, due only to these moving electrons? (b) If a

compass is placed under the wire, in which direction will the needle deflect?