In an iron bar (5 cm × 1 cm×1 cm) the magnetic moment of an atom is 1-8x 10-23 amp-meter2. (a) What will be the magnetic moment of the bar in the state of magnetic saturation ? (b) What torque will have to be applied to keep this bar per- pendicular to an external magnetic field of 15,000 gauss ? Density of iron=7•8 gm/cm3, atomic weight=56, Avogadro's number= 6.02x 1023 and 1 gauss 10-4 newton/(ampere-meter). ||

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