Maxwell was right!

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 horizontally to the right with the same speed $$v$$. The point P is located a perpendicular distance $$a$$ away from each charge as shown in figure. What is the magnetic field at point P?

Details and Assumptions

• $$-\hat{k}$$ denotes into the page and $$\hat{k}$$ denotes out of the page.

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