1. The problem statement, all variables and given/known data E (Vector) = 18.85*cos(omega*t - 15*z) a_x (unit vector) Find H(vector) field 2. Relevant equations I tried ∇ X H = -dD/dt, in which I take the derivative of E(vector). How do I pull H from the curl? 3. The attempt at a solution I took the derivative of -dD/dt, and came up with ∇ X H . I used the matrix to find the partial derivative of H, but I do not know how to find H from the partial derivative. Also, I do not know how to find the direction of H. Can you please help?