A particle of charge and mass is moving with a velocity ( ) towards a large screen…

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

Problem

A particle of charge

q

and mass

m

is moving with a velocity

-v \hat{i}

(

v \neq 0

) towards a large screen placed in the

Y-Z

plane at a distance

d

. If there is a magnetic field

\vec{B} = B_0 \hat{k}

, the minimum value of

v

for which the particle will not hit the screen is: (1)

\frac{qdB_0}{3m}

(2)

\frac{2qdB_0}{m}

(3)

\frac{qdB_0}{m}

(4)

\frac{qdB_0}{2m}