Question

One beam of electrons moves at right angles to a magnetic field. The force on these electrons is 4.9 × 10-14 newtons. A second beam travels at the same speed, but at a 30° angle with the magnetic field. What force is on these electrons?Select one of the options below as your answer:
A. (4.9 × 10-14 newtons) · tan(30°)
B. (4.9 × 10-14 newtons) · sin(30°)
C. (4.9 × 10-14 newtons) · cos(30°)
D. (4.9 × 10-14 newtons) · arctan(30°)
E. (4.9 × 10-14 newtons) · arccos(30°)

Answer 1

there is two situation...
1)F=qvBsin(theta)
in this situation F=4.9*10^-14 N
theta =90 degree.....so sin(theta)=1
q(magnitude)=1.6*10^-19 C
find B

Answer 2

in the second situation you have to find F
you know q,theta,B ...

Answer 3

sin30?

Answer 4

sin30=0.5

Answer 5

well i guess ill go with that

Answer 6

well...you guessed it right...

Answer 7

kool