A charge `+2q` moves vertically upwards with speed `v`, a second charge `-q` moves horizontally to
Channel: Doubtnut
Date: 19/01/2020

A charge `+2q` moves vertically upwards with speed `v`, a second charge `-q` moves horizontally to the right with the same speed `v`, and a third charge `+q` moves horizonatlly to the right with the same speed `v`. The point `P` is located a perpendicular distance a away from each charge as shown in the figure. The magnetic field at point `P` is