A positively charged particle moves with a velocity v in the -x direction such t

Question

A positively charged particle moves with a velocity v in the -x direction such that the magnetic force is directed in the +y direction as shown above. In what direction must the magnetic field be oriented? In the a. +z direction b. -z direction c. +y direction d. -y direction e. x direction In what direction must the electric field be oriented such that the positively charged particle is not deflected by the magnetic force? a. +z direction b. -z direction c. +y direction d. -y direction c. x direction

Explanation / Answer

Here ,

as the magnetic force is given as

F = q * V X B

NOw, direction of v is -i

direction of F is + y direction

using right hand rule

direction of field needed is + z direction

the correct option is a) + z direction

b)

as the electric force must be oposite to the magnetic force

hence , electric field must point in - y direction

the correct option is d) - y direction

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