1, the hall effect was discovered by American physicist E hall in the experiment of 1879, and was named after him, which spread all over the world. The core theory is that charged particles (such as electrons) will be deflected by Lorentz force when they move in the magnetic field, so the current in the magnetic field may also be deflected.

2. Assume that the conductor is a cuboid with lengths of A, B and D respectively, and the magnetic field is perpendicular to the ab plane. Current passes through ad, current I = nqv(ad), and n is charge density. Let the Hall voltage be VH, the electric field of the conductor along the direction of the Hall voltage be VH/A. Let the magnetic induction intensity be B.

Lorentz force F=qE+qvB/c

Extended data

Related applications:

Hall element can be used to monitor and measure the change of working parameters of automobile parts by detecting the change of magnetic field and converting it into electrical signals. Such as position, displacement, angle, angular velocity, rotational speed, etc. , and these variables can be converted twice; It can measure pressure, mass, liquid level, flow rate, velocity and so on. The output of that Hall element is directly interface with the electronic control unit, so that automatic detection can be realized.

Baidu Encyclopedia-Hall Effect