Question

A charged particle P leaves the origin with speed v at some inclination with the x axis. there is uniform magnetic field B along the x-axis. P strikes a fixed target T on the x-axis for a minimum value of B. P will also strike T if

1. magnetic field= 2B and velocity = 2v
2. magnetic field = 2B and velocity = v
3. magnetic field = B and velocity = 2v
4. magnetic field = B/2 and velocity = v

please give me explanation of the answer.

Answer 1

i suppose its the answer feel free to ask

Answer 2

Answer:

2b is the answer.......