Calendar: 1889-1890 Page 761

ENGINEERING DEPARTMENT 115 Describe method of comparing the electrical resistance two wires and explain the principle of the method What ire the relative resistances of two copper wires one of them 16 feet long and weighing 56 grammes the other feet 10ng jnd weighing 525 grammes Show how to compare the magnetic moment of magnet with the horizontal magnetic force of the earth State the laws of the production and distribution of heat in galvanic circuit Show that the quantity of heat which given battery can oduce per unit of time in wire is greatest when the resist- nee of the wire is equal to half the total resistance of the "ircuit י Describe experiments which show that wires conducting 31 ectrie currents attract each other when the currents are in the same direction and repel each other when they are in opposite directions What bearing have these facts on Ampere's theory of magnetism When copper disc is made to spin about an axis in its own plane between the poles of an electro magnet explain the cause of the resistance to the motion of the disc when the magnet is set in action 10 Explain the principle of action of dynamo machine flat coil of wire is caused to rotate about an axis in its own plane explain any electrical effect which may be induced in the wire by the earth's magnetic action tJrositattcg dirt fecat FIRST YEAR Define density and specific gravity pointing out the essential distinction between them Explain how it is that the density of substance has in the Gr system the same numerical value as its specific gravity tube 150 centimetres long holds 600 grammes of mer- cury find its cross section and internal diameter