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A student makes a short electromagnet by winding 430 turns of wire around a wooden cylinder of diameter d = 3.0 cm. The coil is
connected to a battery producing a current of 4.8 A in the wire. (a) What is the magnitude of the magnetic dipole moment of this
device? (b) At what axial distance z >>d will the magnetic field have the magnitude 4.4 μT (approximately one-tenth that of Earth's
magnetic field)?

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