Lecture Notes on Physics |
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acid action angle attracted ball bar-magnet battery body called cause cell cloud coating coil colours concave conductor connected convex lens copper currents flowing Describe an experiment Describe and explain diagram diamagnetism direct current direction discharge distance earth effect electric current electrical machine electrified electrolysis electroscope expand fluid formed galvanometer gases Give glass hydrogen illustrate induction insulated intensity know regarding latent heat length Leyden jar light liquid luminous magnetic meridian magnetic needle metal mirror molecules negative number of vibrations object obtained occurs pass piece placed plane plate platinum polarized pole positive electricity pound of water principal focus prism produced radiation rays reflected refraction refractive index repel rubbed sewing needle shewn silver soft iron sound waves spark specific heat spectrum string substances sulphuric suppose surface temperature theory thermometer torsion balance tube tuning fork velocity of sound voltaic current vulcanite wire zinc
Popular passages
Page 133 - ... the ratio of the specific heat of air at constant pressure to the specific heat at constant volume.
Page 149 - A lath, six feet long, is supported at its centre on a dry glass tumbler. Below one end of the lath, and at a distance of some inches from it, are placed some scraps of gold leaf or other light bodies. A glass rod electrified by friction is brought over the other end of the lath without touching it. The fragments of gold leaf are immediately attracted. How is this attraction produced ? 6.
Page 134 - B with the sound velocity where y is the ratio of the specific heat at constant pressure to the specific heat at constant volume, and p is the gas pressure.
Page 148 - An apple held in the hand and struck with a fox's brush shows no signs of electrical action ; suspended by a string of silk and struck with the brush it becomes electrified, attracting light bodies and causing the leaves of the electroscope to diverge. Explain these results.
Page 149 - Two bar-magnets are placed upon a table parallel to each other, and with their north poles turned in the same direction. Over the magnets is placed a sheet of glass, and over this again a sheet of smooth paper. From a little sieve you carefully scatter iron-filings over this paper. Show by one sketch the manner in which the filings will arrange themselves; and show by another sketch the change that occurs in the arrangement of the filings when one of the magnets is reversed.
Page 148 - A long strip of hard steel is magnetised, and, when your small magnetic needle is passed along the strip, its north point is attracted by one end of the strip, its south point by the other, the centre of the strip appearing to attract neither point of the needle. When the strip is broken across at the centre, what is the action of its two halves upon the magnetic needle ? 4.
Page 148 - A steel fork and a steel knife are connected by wires with a galvanometer. The knife and fork are used to cut a juicy and well-salted beefsteak, what will be the effect upon the galvanometer ? What will be the effect when a silver fork is substituted for the steel one, the steel knife being retained ? 14.
Page 152 - A piece of covered wire is passed a few times round a wooden hoop ; its ends are joined up to a galvanometer. The ends of another piece of covered wire which is wrapped round a similar hoop are joined up to a battery. What will happen if the two hoops are (i) brought quickly near to one another, and (2) if they are quickly separated ? 4. I suspend a magnet by means of a silk thread tied round its centre. I attach the ends of a coil of wire to a galvanometer.
Page 147 - I whisk a bit ot vulcanized india-rubber with a fox's brush. Holding the sealing-wax as a handle, I lay the penny, or half-crown, flat on the indiarubber. What is the condition of the coin ? I touch the coin, what occurs ? I lift it by the handle, what is its condition?
Page 141 - You are to examine by means of a magnetic needle, the magnetic condition of a piece of soft iron. You are also to examine the condition of a piece of magnetic iron ore of the same size and shape as the iron. State some of the differences which are sure to show themselves between both.