A Treatise on Electricity and Magnetism, Volume 2 |
From inside the book
Results 1-5 of 65
Page 1
... suppose the magnet suspended so as to be free to turn in all directions about a fixed point . To eliminate the action of its weight we may suppose this point to be its centre of gravity . Let it come to a position of equilibrium . Mark ...
... suppose the magnet suspended so as to be free to turn in all directions about a fixed point . To eliminate the action of its weight we may suppose this point to be its centre of gravity . Let it come to a position of equilibrium . Mark ...
Page 2
... suppose that the axes of several magnets have been determined , and the end of each which points north marked . Then , if one of these be freely suspended and another brought near it , it is found that two marked ends repel each other ...
... suppose that the axes of several magnets have been determined , and the end of each which points north marked . Then , if one of these be freely suspended and another brought near it , it is found that two marked ends repel each other ...
Page 5
... suppose all magnets to be made up of such particles , it is evident that since the algebraical quantity of magnetism in each particle is zero , the quantity in the whole magnet will also be zero , or in other words , its poles will be ...
... suppose all magnets to be made up of such particles , it is evident that since the algebraical quantity of magnetism in each particle is zero , the quantity in the whole magnet will also be zero , or in other words , its poles will be ...
Page 11
... suppose the second magnet turned through an angle do in a plane perpendicular to a third axis h , then the work done against the magnetic forces will be d W аф do , and the moment of the forces on the magnet in this plane will be - d W ...
... suppose the second magnet turned through an angle do in a plane perpendicular to a third axis h , then the work done against the magnetic forces will be d W аф do , and the moment of the forces on the magnet in this plane will be - d W ...
Page 19
... suppose it to be traced from magnetic south to magnetic north , and shall call this direction positive . In the same way the direction of magnetization of a magnet is indicated by a line drawn from the south end of the magnet towards ...
... suppose it to be traced from magnetic south to magnetic north , and shall call this direction positive . In the same way the direction of magnetization of a magnet is indicated by a line drawn from the south end of the magnet towards ...
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Common terms and phrases
action axes axis B₁ B₂ body centre circle closed curve coefficient coil components conductor constant cylinder deflexion 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 current induced magnetization integral iron kinetic energy line-integral lines of force lines of magnetic magnetic force magnetic induction magnetic moment magnetic potential magnetic shell mathematical measure medium method molecules motion moving needle negative observed opposite direction parallel placed plane pole position potential due produce quantity radius resistance round secondary circuit self-induction sheet shew solenoid solid angle sphere strength substance suppose surface surface-integral terrestrial magnetism theory torsion unit variables vector velocity vertical vibration wire zero
Popular passages
Page 432 - Principle!, 2nd edition. something is transmitted from one particle to another at a distance, what is its condition after it has left the one particle and before it has reached the other...
Page 260 - If we differentiate the first of these equations with respect to x, and the second with respect to -y, and add the results, we obtain £f + ».0.
Page 180 - 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, or made...
Page 432 - 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 144 - If the conductor be a rotating disk or a fluid it will move in obedience to this force, and this motion may or may not be 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...
Page 402 - 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 of the medium, each rotating on its own axis.
Page 162 - The experimental investigation by which Ampere established the laws of the mechanical action between electric currents is one of the most brilliant achievements in science. The whole, theory and experiment, seems as if it had leaped, full grown and full armed, from the brain of the