HELP/// 19.0 Ω, 9.00 Ω, and 2.00 Ω resistors are connected in series with an emf source. The current in the 9.00 Ω resistor is measured to be 15.0 A. a) Calculate the equivalent resistance of the three resistors in the circuit.
Answer in units of Ω.
b) Find the potential difference across the emf source
Answer in units of V.
c) Find the current in the other resistors.
Answer in units of A.

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?