Electricity for Public Schools & CollegesLongmans, Green, & Company, 1903 - 451 páginas |
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Página 43
... Inside the vessel is usually placed some desiccating substance , such as calcium chloride . Two strips of tin - foil are often gummed on to the inside of the vessel so as to be opposite to the gold- leaves ; and these strips should be ...
... Inside the vessel is usually placed some desiccating substance , such as calcium chloride . Two strips of tin - foil are often gummed on to the inside of the vessel so as to be opposite to the gold- leaves ; and these strips should be ...
Página 52
... inside a hollow , charged , conductor . р . B Faraday constructed a small insulated room . He went inside it with delicate electroscopic apparatus , and then the whole was highly charged . No electric field inside , due to this charge ...
... inside a hollow , charged , conductor . р . B Faraday constructed a small insulated room . He went inside it with delicate electroscopic apparatus , and then the whole was highly charged . No electric field inside , due to this charge ...
Página 55
... inside a vessel will be considered later under the head of condensers . They are cases of systems of conductors and not of simple conductors . We shall find the following general facts to hold , it being taken for granted that , unless ...
... inside a vessel will be considered later under the head of condensers . They are cases of systems of conductors and not of simple conductors . We shall find the following general facts to hold , it being taken for granted that , unless ...
Página 57
... inside a closed or nearly closed vessel , there will be no charge upon it , and hence the above action will not occur . Let us , for example , take a tin vessel ( such as a common pint measure ) , and let us fix inside it a needle ...
... inside a closed or nearly closed vessel , there will be no charge upon it , and hence the above action will not occur . Let us , for example , take a tin vessel ( such as a common pint measure ) , and let us fix inside it a needle ...
Página 58
... inside as well as outside , is now opposite to part of the earth ; and the charge will be distributed over the whole surface . Referring to the statement , which is in general true , that ' When a hollow conductor is charged , the ...
... inside as well as outside , is now opposite to part of the earth ; and the charge will be distributed over the whole surface . Referring to the statement , which is in general true , that ' When a hollow conductor is charged , the ...
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Términos y frases comunes
acid acting action ampères angle anode armature arrangement axis battery body called cell centre Chapter charge chemical circuit coil condenser conductor connected consider constant copper couple cylinder deflexion diamagnetic dielectric difference of potential direction disc discharge distance dynes earth earth's field ebonite electricity electro-magnetic electrolytic electrometer electroscope electrostatic energy equal equivalent ergs experiment external field of force field-strength galvanometer give given glass heat Hence horizontal hydrogen induced current instrument insulated iron Joule's law junctions kathode Leyden jar lines of force magnetic field magnetic moment magnetic shell magnetised marked lines means measured metal molecules move Ohm's law ohms opposite Peltier effect phenomena plane plate pole position quantity reader repelled represent resistance respectively rotation spark sphere strength surface t₁ temperature torsion torsion balance tricity unit V₁ vertical vessel Volta's wire zero potential zinc
Pasajes populares
Página xxiii - A mass of 2^ kilogrammes loses, each 2\ minutes, a velocity of 300 metres per 2 hours. Express in dynes the force acting. 4. Two forces, of 30 dynes and 40 dynes respectively, act on a material particle at right angles to one another. Find the magnitude of their resultant, and the angle that it makes with the direction of the smaller force. 5. A force of 5000 dynes is resolved into others acting at right angles to one another. One of these is 3000 dynes. Find the other component, and the angle that...
Página 26 - If they are identical in mass and in dimensions, we have simply that m' - O § 4. Laws of Magnetism. — There are two fundamental laws in magnetism. I. Like poles repel, unlike poles attract, one another. This simple observed fact needs no comment. II. The force between two poles varies inversely as the square of the distance between them. It may also be stated that the force between two poles ^ and // is proportional to the product px p'.
Página 217 - Kirchhoff has enunciated in the form of two ' Laws ' the principles that must guide us in such an investigation. Law I. — If any number of conductors meet at a point, and if all currents flowing to the point be considered +, and ail currents flowing from the point be considered — , and if the condition of things be steady, or the potential at the point be not altering, then the algebraic sum of the currents meeting at the point must be zero. Or 2 . C = o.
Página 179 - DanielFs cell. — In this the only essential difference from the above is that we have copper in a saturated solution of copper sulphate, instead of platinum (or carbon) in nitric acid. But it is usually constructed having the zinc and acid in the porous pot, while very often the copper itself forms the outside vessel. The zinc may be surrounded by a semi-saturated solution of zinc sulphate, or of common salt, instead of by dilute sulphuric acid. Here the hydrogen reduces the copper sulphate ; sulphuric...
Página 30 - ... the vertical plane, that passes through the geographical north and south points, is called the plane of the geographical meridian. The earth's field can be resolved into a vertical and a horizontal component in this plane, as we shall see further in § 13. It is the horizontal component that acts on the ordinary compass, so that the magnetic axis of the needle will come to rest in this line. Hence, the plane of the magnetic meridian can also be defined as that vertical plane that contains the...
Página 127 - In the CGS system the unit of work is called, the ' erg,' and is the work done when a force of one dyne is overcome through a distance of one centimetre along the lines of force.
Página xxxviii - ... are connected with a galvanometer and the coil can be made to rotate about one of its diameters. On turning the coil half round, the galvanometer needle is momentarily deflected, but on causing it to rotate in one direction continuously and rapidly no effect is produced. Explain these two results. 4. A plane rectangular iron frame is placed vertically so that it faces due magnetic north.