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Suppose that the dipole moment associated with an iron atom of an iron bar is 1.7...

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Physics

Suppose that the dipole moment associated with an iron atom ofan iron bar is 1.7 × 10-23 J/T. Assume that all theatoms in the bar, which is 7.0 cm long and has a cross-sectionalarea of 1.1 cm2, have their dipole moments aligned.(a) What is the dipole moment of the bar?(b) What torque must be exerted to hold thismagnet perpendicular to an external field of 2.0 T? (The density ofiron is 7.9 g/cm3 and its molar mass is 55.9 g/mol.)

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