1. The problem statement, all variables and given/known data The resistance of the loop is 0.55 Ω. At what rate the magnetic field strength increasing or decreasing? (a=8.4 cm, I=148 mA. Give answer in T/s.) The loop is a square, so all the distances around are a=8.4 cm 2. Relevant equations dI=AdB dI=rate of change of the flux A=area B=magnetic field 3. The attempt at a solution I found V by using Ohm's Law V=IR, which is the same as emf but now I am lost, I feel like I need to find B, obvious reasons. Do I just use the equation B=Uo*N*I/2R N=1 because only 1 loop Uo= constant I=current R=radius, so half of a?