EXP_1

 




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unit1 viva

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 > Hall effect discovered by Edwin Herbert Hall in 1879. 18 years before electron. >when current is passed in a conductor and then the magnetic field is passed both being perpendicular then a voltage diff is generated due to Lorentz force which is perpendicular to both magnetic field and current this is called hall voltage. >Gauss meter with Gauss Probe can measure both intensity and direction of the magnetic field. >Current source is a power generator whose internal resistance is very high compared to load resistance and it supplies constant power current to load resistance even when load resistance changes over a wide range. >Devices that are used to measure magnetic fields are called Hall probes. It has 4 collinearly placed pins. Current is measured between outer probes and voltage between inner probes. >In this experiment current and voltage stay below some threshold. > hall coefficient is positive for P-type and negative for N-type and 0 for intrinsic. ...
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EXP-2

 if material is germanium  then  current - 3mA Range current - 20 mA Range oven - 1 Range voltage = 100mV range if material is silicon then  current - 3mA Range current - 20 mA Range oven - 1 Range voltage = 1V or 10V range
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