An electromagnet consists of a cardboard cylinder which is wrapped with 50.0 turns/cm ( permeability of air = 1.0 ). When 2.0 A is passed through the helix it is capable of lifting 0.00100 N. a) What permeability core should be added in order for the electromagnet to be able to lift 1.00 x10 2 N? b) How much current should be passed through the electromagnet to increase its strength from 1.00 x 102 N to 2.00 x 102 N ? c) What number of turns is required to increase its strength from 2.00 x 102 N to 5.00 x 102 N