(b) At one instant, the two conductors in a long household extension cord carry equal 3.00 A currents in opposite directions. The two wires are 3.00 mm apart. Find the magnetic field 42.0 cm away from the middle of the straight cord, in the plane of the two wires.

The rocket is fired vertically and tracked by the radar station shown. when θ reaches 66°, other corresponding measurements give the values r = 32700 ft, r¨ = 85 ft/sec2, and θ˙ = 0.019 rad/sec. calculate the magnitudes of the velocity and acceleration of the rocket at this position.