I attached a problem from a practice exam. I'm stuck on part b). Part A, I'm assuming the answer is the standard equation for an infinite current sheet. How do I find induced current? I can only think of using Emf = NBA*ωsintωt Where Emf= I/R, but I don't have resistance. Only other equation I know is K= ρ*ω*r , where ρ is surface charge density, but don't got that either. Any help on the first step? EDIT: Thinking now there might have been a table of resistivity for the copper. Then R can be found easily.