I need help in (a) and (c)
it might be easy for you guys tho​

Can anybody me with this? ? (picture included.)

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?

Write a full page that sumerizes thermodynamics it’s from the website visionlearnig