The principle of Hall effect is used in the construction of which one of the following?

Gaussmeter works based on the principle of the Hall Effect.

Ammeter and voltmeter work based on electrostatic effect.

Important Points

Other Applications of the Hall effect are following-

1. In Determining the Type of Semiconductor-

• By knowing the direction of the Hall Voltage, we can determine that the given sample is whether n-type or p-type semiconductor.
• This is because the Hall coefficient is negative for n-type semiconductors while the same is positive in the case of p-type semiconductors.

2. In Calculation the Carrier Concentration-

• The expressions for the carrier concentrations of electrons (n) and holes (p) in terms of Hall coefficient are given by
• \(n = \frac{1}{{q{R_H}}}\) and \(p = \frac{1}{{q{R_H}}}\)

3. In determining the Mobility (Hall Mobility)-

• Mobility expression for the electrons (μn) and the holes (μp), expressed in terms of Hall coefficient is given by,
• μn = σnRH and μp = σpRH    
• Where, σn and σp represent the conductivity due to the electrons and the holes, respectively.

4. In Measurement of  Magnetic Flux Density

• This equation can be readily deduced from the equation of Hall voltage and is given by
• \(B = \frac{{{V_H}d}}{{{R_H}I}}\)

5. There are many commercially available types of equipment based on the principle of Hall-effect including Hall-effect sensors and Hall-effect probes.

Hall effect sensors are used to detect variables such as the proximity, speed, or displacement of a mechanical system.