CHAPTER 20

Magnetism

1 . Two long wires carry current perpendicular to the page in opposite directions as shown. The left
wire has twice the current of the right wire. At which location will the magnetic field be closest to
zero?
(A) A
(B) B
(C) C
(D) D
(E) E

2 . A proton with a velocity (v) is moving directly away from a wire carrying a current (I) directed to
the right in the +x direction, as shown in the figure. The proton will experience a force in which
direction?
(A) –x
(B) –y
(C) –z
(D) +x
(E) +z