This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...to r and dl. ddf = element of field at P due to current in dl. px = angle between d3C and the X axis. be the X component of /. d3fx= a i cc dl la oc sin 6 (225) By definition. By experiment. By experiment. By experiment. (228) 9fx = k f 1'Smg'CS---/o' The unit of current is called the electro-magnetic unit of current ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...to r and dl. ddf = element of field at P due to current in dl. px = angle between d3C and the X axis. be the X component of /. d3fx= a i cc dl la oc sin 6 (225) By definition. By experiment. By experiment. By experiment. (228) 9fx = k f 1'Smg'CS---/o' The unit of current is called the electro-magnetic unit of current if the unit of length is the centimeter, the unit of intensity is the electro-magnetic unit of intensity, and the constant, k, is equal to one..'. In electromagnetic units: (229) dfx=-f' 'sin "'cos Vx.dl An illustration of unit current, in the electro-magnetic system, is such a current that, in unit arc of unit circle it produces unit field at the center. The practical unit of current is called the ampere and is defined as one tenth of the electro-magnetic unit of current. One ampere = (10)"1 e.m.u. of current. or (Number of amperes) (lO)"1 = (Number of e.m.u. of the same current). Equations similar to (229) can be written for components along the other axes. See appendix on International Units. Thus the resultant field at any point for any conductor may be completely determined in magnitude and direction. Usually the X axis may be taken in the direction of the resultant field so that equation (229) is sufficient. Field at the Center of a Circular Conductor.--Let ABC, Fig. 42, be a, circular conductor of radius a. Let P be the point at the center. Select as X axis, the line passing through P which is perpendicular to the plane of the coil. Let dl be an element of length of the conductor. In which 3fx = intensity at the center, in e.m.u. a = radius in centimeters. i = current in e.m.u. n = number of turns of wire. If 3Cx is compared with efCe, the horizontal component of the earth s field, by the method of the magnetometer, (...
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Add this copy of Elementary Principles Of Electricity And Magnetism: For to cart. $39.75, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2010 by Kessinger Publishing.
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Add this copy of Elementary Principles Of Electricity And Magnetism: For to cart. $39.76, new condition, Sold by Booksplease rated 3.0 out of 5 stars, ships from Southport, MERSEYSIDE, UNITED KINGDOM, published 2009 by Kessinger Publishing.
Add this copy of Elementary Principles of Electricity and Magnetism: for to cart. $59.29, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2009 by Kessinger Publishing.
