Moving a length of copper wire through a

magnetic field may cause the wire to have a

(1) potential difference across it

(2) lower temperature

(3) lower resistivity

(4) higher resistance

The correct answer is A. It may cause the wire to have a potential difference across it.

This is because of the Faradays Law that says, when a conductor moves through a magnetic field, there will be a generated motional electro motive force and will induce current across the wire.

The voltage will be generated on the length of the wire, assuming that the entire wire moves through a uniform field.

(1) potential difference across it. Moving a conductor through a magnetic field means there is a change of magnetic flux across the conductor, that generates an emf in the conductor.