1: Two long parallel wires placed side-by-side on a horizontal table in front of you carry identical currents flowing in opposite directions. The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires
A) points upward.
B) points downward.
C) points toward you.
D) points away from you.
2: Consider a solenoid of length L, N turns, and radius b (L is much longer than b). A current I is flowing through the wire. If the radius of the solenoid were doubled (becoming 2b), and all other quantities remained the same, the magnetic field inside the solenoid would
A) become four times as strong.
B) become twice as strong.
C) remain the same.
D) become one half as strong.