A current runs from the left to the right in a long, straight wire. How does the magnetic field at point X compare with the magnetic field at point Y?
A. The magnetic field at point X points into the page, and the magnetic field at point Y points into the page.
B. The magnetic field at point X points out of the page, and the magnetic field at point Y points out of the page.
C. The magnetic field at point X points out of the page, and the magnetic field at point Y points into the page.
D. The magnetic field at point X points into the page, and the magnetic field at point Y points out of the page.