Calendar: 1887-1888 Page 676

680 APPLIED SCIENCES 17 Compare the magnetic moment of magnet with the horizontal magnetic force of the earth 18 Describe method of measuring the efficiency of an electric motor IV psicS eiectvtcttp ant iHacjnettem SECOND AND THIRD YEARS Describe Coulomb's method of investigating the laws of electrical attraction and repulsion and state the results of his investigations Describe experiments shewing that the free electricity on charged body is entirely upon its surface what con- elusions may be drawn from these experiments as to the laws of electrical attraction and repulsion Explain the meaning of the terms lines of force- potential at point-microfarad-volt-capacity of con- denser Describe method of comparing the capacities of two condensers What is the nature of the action of the earth's magnetic force on freely suspended magnetic needle Describe method of determining the horizontal magnetic force of the earth Explain method of comparing the electrical resistances of two wires What are the relative resistances of two copper wires one of them 3048 cm long and weighing 35 grammes and the other 18 29 cm long and weighing 105 grammes Define the term electromotive force battery of 10 cells is joined to voltameter and 60 cubic centimetres of hydrogen are produced in minute An additional resistance of 15 ohms is introduced and the volume of hydrogen pro- duced in minute is now 36 determine the electro- motive force of one cell of the battery