Question

uses of lorentz force

Answer 1

Applications of Lorentz force in medical acoustics: Lorentz force hydrophone,Lorentz Force Electrical Impedance Tomography, Imaging of shear waves induced by Lorentz force. ... In this method, a biological tissue is vibrated by ultrasound in a magnetic field, which induces an electrical current by Lorentz force.

Answer 2

Forces are as fundamental to Newtonian mechanics as fresh vegetables are to cooking. In particular, the Lorentz force applies whenever an electromagnetic (EM) field interacts with a charged particle. This happens quite a lot.

F⃗ =qE⃗ +qv⃗ ×B⃗ F→=qE→+qv→×B→

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The first real life application which comes to mind is the bubble chamber

It’s a device used to “graph” the trajectories of charged particles. The principle is simple: you have an external magnetic field which will deviate the particles, and an overall “friction” force which will slow the particles down (the bubbles).
This is what it can look like: every single line is the trajectory of some particles. The lines are curved because of the M-field, and form spirals because the particles are slowed down by the bubbles.

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Second application: Plasmas

A plasma is a “gaz” of particles so excited they let go of a few of their electrons. This excitation is commonly done by thermal excitation (eg. every single star), but can also be done by external ionizing radiation (eg. the ionosphere).

Polar auroras are plasmas (just leaving that here)

What happens in a plasma is that some charged particles are free to move around, and their acceleration lead to an emitted, local, EM-field. They all interact together, striving to get a stable organization, while thermal energy keeps randomly agitating them. This results in a fascinating, chaotic yet organized system.

While it’s generally not possible to consider every charge in the modelization, the Lorentz force isthere (a statistical approach is generally needed, and sometimes a quantum-statistical approach is necessary).