A wire carries current in the plane of this paper towar...
单项选择题 A wire carries current in the plane of this paper toward the top of the page. The wire experiences a magnetic force toward the right edge of the page. The direction of the magnetic field causing this force is:
A．in the plane of the page and toward the left edge.
B．in the plane of the page and toward the bottom edge.
C．upward out of the page.
D．downward into the page.
