1. The problem statement, all variables and given/known data There's a coil, resistance R=7Ω, and inductance L=1mH, and its powered by a generator with variable frequency and Vmax=10V. At what frequency is inductive reactance equal to resistance? (when z=R√2) 2. Relevant equations z=R√2, z=√(R2+(ωL)2) 3. The attempt at a solution I plugged in z=R√2 to z=√(R2+(ωL)2), and solved for ω. This ends up just simplifying to ω=R/L, which is 7Ω/0.001H, giving 7000Hz. But my teachers answer is 1110Hz. Am I doing something wrong here? Been stuck on this for a while.