A proton of charge and speed enters the same uniform magnetic field three separate…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A proton of charge

q

and speed

v

enters the same uniform magnetic field

B

three separate times at the following angles relative to the field:

\theta_1 = 30^{\circ}

\theta_2 = 60^{\circ}

, and

\theta_3 = 120^{\circ}

. Let

F_1

F_2

, and

F_3

be the corresponding magnitudes of the magnetic force. Which ranking is correct? (a)

F_1 > F_2 = F_3

(b)

F_1 = F_2 = F_3

(c)

F_1 < F_2 = F_3

(d)

F_1 = F_3 < F_2