Advanced Physics by S. M. Geddes (auth.)

By S. M. Geddes (auth.)

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25 The moving-coil milliammeter By shaping the poles of the permanent magnet suitably around the softiron core, it is possible to arrange that the magnetic field is everywhere radial. e. its divisions will all be the same size. This is a great convenience for a general-purpose measuring instrument. An ammeter is always connected into a circuit in series, and so should ELECTRICITY AND MAGNETISM 49 have low resistance in order not to alter the current that is to be measured. The resistance of the coil can only be kept low by using few turns, and this makes the instrument less sensitive.

14 Dimensions used in calculations relating to the thermal conductivity ofa tube This slab is conducting the quantity of heat W per second between its opposite faces, one at l00°C and the other at the mean observed temperature of the water. The thermal conductivity of the tubing may thus be calculated. EXERCISES Take any necessary values of thermal conductivity from Table 2. 05 m if a temperature difference of 10°C exists between the two square faces, and the four long faces are perfectly lagged.

0 x 10- 7 respectively. 2 A, (ii) how fast these electrons must be moving if the cross-sectional area of the wire is 1 mm 2 and there are 10 28 free electrons per m 3 . 15 mm in diameter. Current flow in liquids A great many liquids are decomposed when an electric current passes through them. This process, known as electrolysis, will not be dealt with in this book as it is more the concern of the chemist than the physicist. It is possible to measure the resistance of a cylinder of liquid using a ELECTRICITY AND MAGNETISM 35 Wheatstone's bridge circuit, but alternating current must be used to avoid any electrolytic effect, and headphones or a cathode-ray oscilloscope are then needed as detectors of the balance-point instead of a galvanometer.

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