The figure below shows a possible device for measuring magnetic fields. A loop carrying a current I is dipped into a region of magnetic field. The loop is suspended from a spring of constant k that stretches if the magnetic field points in the direction indicated. Here the loop has width l = 1.50 cm, I = 1.20 mA, the spring stretches 4.00 mm, k = 4.00Ă—10^-4 N/m, and the magnetic field is uniform. What is the magnitude of the field? Is the current direction clockwise? Recall that the spring force is given by Hooke's Law.