In Problem 42, a formula for the magnetic field along the axis of a solenoid is given.
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In Problem 42, a formula for the magnetic field along the axis of a solenoid is given. For x?>> ??and ??> R, the angles ?1 and ?2 in Equation 29-35 are very small, so the small-angle approximation cos ? ? 1 ? ?2/2 is valid.
(a) Draw a diagram and show that
(b) Show that the magnetic field at a point far from either end of the solenoid can be written
Where r1 = x?? ?? is the distance to the near end of the solenoid, r2 = x?+???is the distance to the far end, and qm = nIpR2 = ?/ l , where ? = NIpR2 is the magnetic moment of the solenoid.
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Fundamentals of Ethics for Scientists and Engineers
ISBN: 978-0195134889
1st Edition
Authors: Edmund G. Seebauer, Robert L. Barry
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