Magnetic fields and force
23 . A positive point charge enters a uniform rightward magnetic field with a velocity v , as diagramed
above. What is the direction of the magnetic force on the charge?
(A) in the same direction as v
(B) to the right
(C) to the left
(D) out of the page
(E) into the page
24 . A long wire carries a current I toward the top of the page. What is the direction of the magnetic field
produced by this wire to the left of the wire?
(A) into the page
(B) out of the page
(C) toward the bottom of the page
(D) toward the top of the page
(E) to the right