By J. Jenkins, W. Ashhurst, W. H. Jarvis
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5: The Hall effect, and its use in a fluxmeter. 8, in which the 25 kü potentiometers VRl and VR2 are used to zero the galvanometers when the germanium chips are in zero (or earth only) field, by balancing out random voltage gradients. Ks>T :VR, 2 to 4V DC :VR2 : 25Ι<Ω FIG. 8. Ensure that the two galvanometers, if their terminals are not distinguished by + and — signs or colour, will each deflect in the same direction when a current is passed in the same way. Some centre-zero galvanometers have randomly connected terminals.
2 between collisions with lattice atoms. Why is such a simple derivation un satisfactory in the case of a degenerate electron gas? Describe experiments to measure (a) the majority carrier density and (b) the majority carrier mobility in a sample of semiconductor material. E. Part 3, Physical Electronics, June 1967) 5· Crystalline pure germanium has 4*5XlO28 atoms m~3. At 300°K one atom in 2XlO9 is ionized. The mobilities of electrons and holes at 300°K are respectively 0*4 m2/V s and 0*2 m2/V s.
Lay it flat in the middle, and carefully butfirmlystick it down with half-inch self-adhesive masking tape (Sellotape could be used). Fix two flexible leads to the rule, then solder their ends to the foil con tacts of the gauge, in such a way that they exert as little as possible force in any direction on the element. 7. When the rule is bent along its length from the ends, the meter reading will vary by an amount which can be read quite easily, before returning to its former value. When the rule is released, the reading temporarily changes in the opposite direc tion.