A 138 turn circular coil has a diameter of 2.00 cm and resistance of 53.0 Ω. The plane of the coil is perpendicular to a uniform magnetic field of magnitude 1.00 T. The direction of the field is suddenly reversed. a.) Find the total charge that passes through the coil. b.) If the reversal takes 0.100 s, find the average current in the coil. c.) Find the average emf in the coil. I am using stuff for a solenoid is that the same as a circular coil? l=lenght n= # of turns per unit length N=n*l total # of turns A=π*r^2 Magnetic Flux=B*A (threw one turn) B=mu_0*n*I (magnetic field inside solenoid) Inductance=((N*(B*A))/I)=mu_0*n^2*A*l E=IR I don't know what to do. Any suggestions ?