Two long straight wires lie in the plane of the page, crossing at right angles at the origin without touching. One runs along the x-axis and carries $10\ \text{A}$ in the $+x$ direction; the other runs along the y-axis and carries $10\ \text{A}$ in the $+y$ direction, as shown in the figure. Point P is at $(5\ \text{cm}, 5\ \text{cm})$ and point Q is at $(-5\ \text{cm}, 5\ \text{cm})$. The magnetic fields at P and at Q are

Fig. 1: Two long wires crossing at right angles at the origin, one along the x-axis carrying 10 A in the +x direction and one along the y-axis carrying 10 A in the +y direction. P is at (5 cm, 5 cm) and Q at (-5 cm, 5 cm).