Question: A U-shaped electromagnet of length I, pole separation d, and permeability u has a square cross section of area A. It is wound with

A U-shaped electromagnet of length I, pole separation d, and permeability u

has a square cross section of area A. It is wound with

A U-shaped electromagnet of length I, pole separation d, and permeability u has a square cross section of area A. It is wound with N turns of wire carrying a current I. Calculate the force' with which the magnet holds a bar of the same material (of the same cross section) against its poles.

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