A Treatise on Electricity and Magnetism, Volume 2Clarendon Press, 1881 |
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Common terms and phrases
A₁ action axes axis B₁ B₂ body C₁ centre circle closed curve coefficient coil components conductor constant deflexion denote depends determine diamagnetic dip circle distance ds ds dx dy dz electric current electromagnetic force electromotive force electrostatic element equal equation equilibrium experiments expression Faraday force acting function galvanometer given Hence horizontal induced magnetization integration iron kinetic energy line-integral lines of magnetic magnetic force magnetic induction magnetic moment magnetic potential magnetic shell measure medium method molecules motion needle negative observed opposite direction P₁ parallel perpendicular placed plane pole position potential due produce quantity radius resistance round secondary circuit self-induction sheet shew shewn solenoid solid angle sphere strength substance suppose surface surface-integral terrestrial magnetism theory torsion unit vector velocity vertical vibration wire zero аф
Popular passages
Page 12 - Vol. II. The Sacred Laws of the Aryas, as taught in the Schools of Apastamba, Gautama, VâsishMa, and Baudhâyana. Translated by Prof. Georg Bühler. Part I. Apastamba and Gautama. 8vo. cloth, ios. 6d. Vol. III. The Sacred Books of China. The Texts of Confucianism.
Page 400 - ... sunlight would experience this pressure on its illuminated side only, and would therefore be repelled from the side on which the light falls. It is probable that a much greater energy of radiation might be obtained by means of the concentrated rays of the electric lamp. Such rays falling on a thin metallic disk, delicately suspended in a vacuum, might perhaps produce an observable mechanical effect.
Page 186 - The number of degrees of freedom of a system is the number of data which must be given in order completely to determine its position.
Page 1 - A New English Dictionary, on Historical Principles : founded mainly on the materials collected by the Philological Society. Edited by James AH Murray, LL.D., President of the Philological Society ; with the assistance of many Scholars and men of Science. Part I.
Page 181 - Returning to the phenomena in question, the first thought that arises in the mind is, that the electricity circulates with something like momentum or inertia in the wire, and that thus a long wire produces effects at the instant the current is stopped, which a short wire cannot produce. Such an explanation is, however, at once set aside by the fact, that the same length of wire produces the effects in very different degrees, according as it is simply extended...
Page 417 - The consideration of the action of magnetism on polarized light leads, as we have seen, to the conclusion that in a medium under the action of magnetic force something belonging to the same mathematical class as an angular velocity, whose axis is in the direction of the magnetic force, forms a part of the phenomenon. This angular velocity cannot be that of any portion of the medium of sensible dimensions rotating as a whole. We must therefore conceive the rotation to be that of very small portions...
Page 447 - In fact, whenever energy is transmitted from one body to another in time, there must be a medium or substance in which the energy exists after it leaves one body and before it reaches the other, for energy, as Torricelli * remarked, ' is a quintessence of so subtile a nature that it cannot be contained in any vessel except the inmost substance of material things.
Page 396 - In other media than air, the velocity V is inversely proportional to the square root of the product of the dielectric and the magnetic inductive capacities. According to the undulatory theory, the velocity of light in different media is inversely proportional to their indices of refraction. There are no transparent media for which the magnetic capacity differs from that of air more than by a very small fraction. Hence the principal part of the difference between these media -must depend on their...
Page 446 - ... of a condition of motion or stress in a medium already existing in space. In the theory of Neumann, the mathematical conception called Potential, which we are unable to conceive as a material substance, is supposed to be projected from one particle to another, in a manner which is quite independent of a medium, and which, as Neumann has himself pointed out, is extremely different from that of the propagation of light. In the theories of Riemann and Betti it would appear that the action is supposed...
Page 146 - ... accompanied with a change of position of the electric current which it carries. But if the current itself be free to choose any path through a fixed solid conductor or a network of wires, then, when a constant magnetic force is made to act on the system, the path of the current through the conductors is not permanently altered, but after certain transient phenomena, called induction currents, have subsided, the distribution of the current will be found to be the same as if no magnetic force were...