Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Question
Chapter 27, Problem 61P
To determine
The magnetic moment of Cobalt.
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A sample of paramagnetic salt contains 2.0 × 1024 atomic dipoles each of dipole moment 1.5×10-23 J T-1. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law)
Niobium metal becomes a superconductor(with zero electrical resistance) when cooledbelow 8.3 K.The permeabilty of free space is 1.25664 ×10−6 N/A2.If superconductivity is destroyed when thesurface magnetic field exceeds 0.15 T, determine the maximum current a 3.2 mm diameter niobium wire can carry and remain superconducting.Answer in units of A.
A Hall probe serves to measure magnetic field strength. One such probe consists of a poor conductor 0.121 mm thick, whose charge‑carrier density is 1.27×1025 m−3. When a 1.77 A current flows through the probe, the Hall voltage is measured to be 3.15 mV. The elementary charge e=1.602×10−19 C.
What is the magnetic field strength B?
Chapter 27 Solutions
Physics for Scientists and Engineers
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