\begin{problem*}{30.61}
Two long, straight wires cross each other perpendicularly as shown in
-Figure P30.61. The wires do not touch. Find \Part{a} the magnitude
+Figure~P30.61. The wires do not touch. Find \Part{a} the magnitude
and \Part{b} the direction of the magnetic field at point $P$, which
is in the same plane as the two wires. \Part{c} Find the magnetic
field at a point $30.0\U{cm}$ above the point of intersection of the