Question

An electron travels westward in a region that contains a magnetic field experiences an upward force vertically off the earth's surface. What was the direction of the magnetic field?

A. East

B. South

C. Under the paper

D. on the top the paper

E. North

Answer 1

(-i) w W E i q=-e then velocity vector y = ut? (toward west ) magnetic boree vector P = F (Å) change on election Let magnetic field vector B = Bĥ ñ = ? F = q cox B) F (R) [w-åx BÅ F (R) Et eVB lixh => r = ix ñ should be j (ie North) ex = = e = > ( X J = flence Direction of magnetic field E North