The Hall constant thus gives a direct indication of the sign of the charge carriers; it is negative for electrons (q =−e) and positive for … EXPERIMENT 20 The Hall Effect Note: Please read the Radiation Safety Regulations at the back of this book Objectives of the Experiment The behaviour of the Hall voltage in a sample of doped germanium is studied in three different set-ups as follows: 1. The production of transverse voltage across a current carrying conductor when placed in a perpendicular magnetic field,is called Hall effect.The voltage developed across the conductor is called Hall voltage. The electrons take a drift velocity v d = -μE x proportional to the electric fiel E x . From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative. This is in agreement with and very close to the literary value of 0.67 eV. OVERVIEW In the hall effect experiment, we determine the hall voltage and hall coefficient. The Hall constant thus gives a direct indication of the sign of the charge carriers; it is negative for electrons (q =−e) and positive for … The Hall coefficients of n-type and p-type doped germanium samples were measured and found to be (respe ) and ( ) ctively. The Hall Coefficient R H is mathematically expressed as $$R_H=\frac{E}{jB}$$ Where j is the current density of the carrier electron, Ey is the induced electric field and B is the magnetic strength. Hall effect Aim :- 1) To determine the Hall coefficient (R H) 2) To measure the unknown magnetic field (B Y1) and to compare it with that measured by the Gaussmeter (B Y2). Hall Coefficient. Constant magnetic ﬁeld … In 1879, E.H. Hall devised an experiment that can be used to identify the sign of the predominant charge carriers in a conducting material. The Drude model thus predicts nq RH 1 = . The hall coefficient is positive if the number of positive charges is more than the negative charges. What is the principle of the Hall effect ?”When we place a current-carrying semiconductor specimen in the presence of a uniform magnetic field, a potential difference creates between the two faces. The Hall Coefficient (or Constant) RH is officially defined as this proportionality constant: Ey =RH JB. Apparatus :- 1) Gauss meter with probe 2) Electromagnet 3) Constant current source to Pass current through electromagnet These measurements will enable the student to determine: the type (n or p) and doping density of the sample as well as the majority carrier’s “Hall mobility.” 2. A current can be thought of as a negative charge moving in one direction (Figure 1) or as a positive charge moving in the opposite direction (Figure 2). The Hall Coefficient (or Constant) RH is officially defined as this proportionality constant: Ey =RH JB. In this experiment, the band gap energy of undoped germanium was measured and found to be 0.73 ± 0.03 eV. 2. 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