This is a physics question for my test I really need it with every single step

Will you chech and finish these for me, because i am stumped with them.

Which atomic model was proposed as a result of j. j. thomson’s work?

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?