A straight wire carries a current into the paper. The diagram shows three magnetic field lines surrounding the wire. The current in the wire increases. What is the direction of the field lines, and what change happens to the field lines as the current increases?
- Aclockwise; the lines move closer together
- Bclockwise; the lines move further apart
- Canticlockwise; the lines move closer together
- Danticlockwise; the lines move further apart