A positively charged particle of mass is at rest on a table

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

Problem

A positively charged particle of mass

m

is at rest on a table. A non-zero electric field

E

is directed into the plane of the table. A non-zero magnetic field

B

is directed out of the plane of the table. What is true about the magnitude of the electric force on the particle,

F_E

, compared with the magnetic force on the particle,

F_B

? (A)

F_E > F_B

(B)

F_E < F_B

(C)

F_E = F_B

(D) It cannot be determined without knowing the exact value of the charge of the particle.