1. The problem statement, all variables and given/known data Hey guys, I have a physics II test tomorrow on Electricity and Magnetism, and I cannot seem to figure out this question. The rectangular loop in the figure has 2.2×10−2Ω resistance. What is the induced current in the loop at this instant? Picture: 2. Relevant equations E = d(flux m)/dt B = (mu_0)(I)/2(pi)(r) flux m = integral (B * DA) 3. The attempt at a solution However, the area is not changing, so I can pull that out of the integral. Then I have to integrate: (mu_not)(I)/2(pi)(r) Everything is constant except 1/r, so I can pull everything out and be left with: integral (1/r)dr = ln(r) So now we have: E = d/dt(A)*(mu_not*I)*(ln(r))/(2*pi) How do I take the derivative of this with respect to time? Did I do the other steps correctly?