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A charge \( +2 q \) 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 the figure. The magnetic field at point \( P \) is
(a) Into the page with magnitude \( \frac{\mu_{0}}{4 \pi} \frac{2 q v}{a^{2}} \).
(b) Into the page with magnitude \( \frac{\mu_{0}}{4 \pi} \frac{4 q v}{a^{2}} \).
(c) Out of the page with magnitude \( \frac{\mu_{0}}{4 \pi} \frac{2 q v}{a^{2}} \).
(d) Out the page with magnitude \( \frac{\mu_{0}}{4 \pi} \frac{4 q v}{a^{2}} \).
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