The Hall Coefficient (or Constant) RH is officially defined as this proportionality constant: Ey =RH JB. 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). 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 … This is in agreement with and very close to the literary value of 0.67 eV. 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. Hall Coefficient. The Drude model thus predicts nq RH 1 = . 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. 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 coefficients of n-type and p-type doped germanium samples were measured and found to be (respe ) and ( ) ctively. 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. 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. The Hall Coefficient (or Constant) RH is officially defined as this proportionality constant: Ey =RH JB. 2. The hall coefficient is positive if the number of positive charges is more than the negative charges. 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 … Constant magnetic ﬁeld … In the hall effect experiment, we determine the hall voltage and hall coefficient. Apparatus :- 1) Gauss meter with probe 2) Electromagnet 3) Constant current source to Pass current through electromagnet The Drude model thus predicts nq RH 1 = . In this experiment, the band gap energy of undoped germanium was measured and found to be 0.73 ± 0.03 eV. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative. The Hall Effect voltage, V H, and Hall coefficient, R H, for the same sample will be measured using a magnetic field. The Hall Effect experiment (conducted by Edwin Hall in 1879) determines the sign of the charge carriers in current flow. The electrons take a drift velocity v d = -μE x proportional to the electric fiel E x . 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