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Suppose that the dipole moment associated with an iron atom of an iron bar is 1.7 x 10-23 J/T. Assume
that all the atoms in the bar, which is 5.0 cm long and has a cross-sectional area of 1.2 cm², have their
dipole moments aligned. (a) What is the dipole moment of the bar? (b) What torque must be exerted to
hold this magnet perpendicular to an external field of 1.8 T? (The density of iron is 7.9 g/cm³ and its molar
mass is 55.9 g/mol.)
(a) Number i
(b) Number
Units
Units

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