Calendar: 1870-1871 Page 534

53i APPLIED SCIENCES Show how to determine the magnetic dip at any point of the earth's surface taking into account any errors to which the dipping needle may be liable Explain the terms "electric density "electric tension power of points Describe experiments which show that no force exists on the interior of closed conductor Explain the theory of the condenser Show how to com- pare the electric capacity of the inner coating of jar when the outer coating is insulated with its capacity when the outer coating is uninsulated Define specific inductive capacity Describe Faraday's method of determining the specific inductive capacity of various substances What is meant by the term electromotive force The current from battery of ten equal elements passes through voltameter and 50 cubic centimetres of hydrogen are produced in minute 50 metres of wire are now introduced in addition into the circuit and the volume of hydrogen now evolved in the voltameter per minute is 30 cubic centimetres If the resistance of metres of the introduced wire be the unit of resistance and the unit of current be that which disengages one cubic centi- metre of hydrogen per minute what is the electromotive force of one element of the battery State and explain Ohm's Law With given external resistance show how to obtain the current of greatest strength which can be produced from battery of given number of cells Describe the construction of and the nature of the chemical action in Daniell's cell What are its special advantages State the general laws of the production of induced cur- rents Describe an experiment which proves the inductive action of current in coiled conductor upon itself at the moment of breaking the connexion with the battery 10 Define specific electrical resistance Explain the principle of the method of comparing the electrical resistance of conductors by means of Wheatstone's balance wire 874 millimetres long and weighing 0822 gramme in vacuo and 0730 gramme in water has resistance of 0-1257 Find the specific resistance per cubic millimetre of the material of the wire