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A studetn needs to make a solenoid that produses 1.09 T at its center. a wire will be wrapped around a solid cylinder of iron with a relative permeability Km of 1400, a length of 13.3 cm and a radius of 1.92 cm. if the wire can carry a max current of 1.15 A how many turns of wire are neede to produce the desired B field?