# Elementary Lessons in Electricity & Magnetism

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## Description

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. 1886 edition. Excerpt: ...intercepted by the circuit. Hence the symbol M must represent the number of each other's lines of force mutually intercepted by both circuits, if each carried unit current. If we call the two circuits A and B, then, when each carries unit current, A intercepts M lines of force belonging to B, and B intercepts M lines of force belonging to A. Now suppose both currents to run in the same (clock-wise) direction; the front or S.-seeking face of one circuit will be opposite to the back or N.-seeking face of the other circuit, and they will attract one another, and will actually do work as they approach one another, or (as the negative sign shows) negative work will be done in bringing up one to the other. When they have attracted one another up as much as possible the circuits will coincide in direction and position as nearly as can ever be. Their potential energy will have run down to its lowest minimum, their mutual potential being a negative maximum, and their coefficient of mutual potential M, having its greatest possible value. Two circuits, then, are urged so that their coefficient of mutual potential M shall have the greatest possible value. This justifies Maxwell's Rule (Art. 193), because M represents the number of lines of force mutually intercepted by both circuits. And since in this position each circuit induces as many lines of magnetic force as possible through the other, the coefficient of mutual potential M is also called the coefficient of mutual induction. NOTE ON MAGNETIC AND ELECTRO-MAGNETIC UNITS. 321. Magnetic Units.--All magnetic quantities, strength of poles, intensity of magnetisation, etc., are expressed in terms of special units derived from the fundamental units of length, mass, and time, explained in the Note on...show more

## Product details

• Paperback | 160 pages
• 189 x 246 x 9mm | 299g
• Miami Fl, United States
• English
• black & white illustrations
• 1236553454
• 9781236553454