# Magnetic field line length

If I had a magnetic bar in space that was 2cm wide and 2cm high and was one Earth diameter long and had the same magnetic strength as the Earth, would the distribution of field lines be the same length and width as the Earth's field lines?

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Your bar will not work as you want. It will break apart. Too long and too thin. So no shielding. –  Asphir Dom Mar 8 '13 at 10:25