## Exercises in Electrical & Magnetic Measurement |

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additional resistance amount of heat ampere angular Answer axis bar magnet battery bound charge C.G.S. unit capacity centi centimetres long centimetres radius centre coil collecting plate condensing plate connected copper wire cubic centimetres Daniell's cell difference of potential disc dynes earth's magnetic force electrical density electromagnetic units electromotive force equal ergs extrapolar resistance Find the resistance Find the strength gramme of zinc grammes Grove's cells heat developed horizontal intensity inertia insulated metal iron wire joule last Example Leyden jar lines of force magnetic field magnetic meridian magnetic moment magnetic pole mass metres long microhms microvolts milliamperes milligrammes millimetre minute moment of inertia multiple arc nearly needle Ohm's law ohms resistance placed plane platinum resistance per cubic right angles ring shunt small magnet specific resistance square centimetres strength of current tangent galvanometer thick torsion balance torsion head turns of wire twist vertical volt voltameter volts zinc

### Popular passages

Page vi - IN physical science a first essential step in the direction of learning any subject, is to find principles of numerical reckoning, and methods for practicably measuring, some quality connected with it. I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind...

Page 168 - If a line be imagined passing from Dover to Calais through the sea, and returning through the land, beneath the water, to Dover, it traces out a circuit of conducting matter one part of which, when the water moves up or down the channel, is cutting the magnetic curves of the earth, whilst the other is relatively at rest.

Page 120 - Mag., 1851) established the important theorem that the electro-motive force of an electro-chemical apparatus is, in absolute measure, equal to the mechanical equivalent of the chemical action on one electro-chemical equivalent of the substance.