How much energy is required to change a 42g ice cube from ice at -11c to steam at 111c

Idon’t quite understand this problem

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?

How can you increase the strength of an electromagnet?