# Want to understand physics?

I am Alexander Fufaev, physicist and owner of this website. Here you can find free, high-quality content about physics. Courses, exercises with solutions, questions and answers and much more!

## Courses

A course is an ordered learning unit that will take you step by step through a comprehensive physics topic so that by the end you will have mastered it.

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Video

## Hermite Operators Simply Explained

In this physics video you will learn what Hermitian operators and matrices are and what important properties they have.

Content of the video
1. 00:00 Motivation: Real mean values
2. 01:16 What are Hermitian operators?
3. 02:16 What is a self-adjoint operator?
4. 02:56 Notation of a Hermitian operator
5. 03:20 Eigenvalues are real
6. 04:27 Eigenvectors are orthogonal
7. 05:56 Eigenvectors form a basis
8. 06:37 What is a Hermite matrix?
9. 07:19 Examples for (non) Hermitian matrices
Lesson
Level 2 (suitable for students)

## Lorentz Force: How to Determine its Direction and Understand Formula

Learn how Lorentz force (magnetic force) deflects a moving charge (electron) in the magnetic field and how you can determine the direction of the deflection.

Video
Level 2 (suitable for students)

## Lorentz force simply explained in 6 minutes!

In this video you will learn how to determine the direction of the Lorentz force using left/right hand rule and how this force is calculated and related to the centripetal force.

Content of the video
1. 00:00 What is Lorentz force?
2. 00:28 Moving charge perpendicular to the magnetic field
3. 01:12 Determine Lorentz force direction
4. 02:40 Lorentz force qvB-equation
5. 04:12 Movement at an angle to the magnetic field
6. 04:59 Lorentz and centripetal force
7. 06:20 Determine velocity of the electron
Lesson

## Hall Effect: A Simple Explanation of How Hall Voltage is Created

Explanation of what the Hall effect is, how exactly the Hall voltage is generated and how you can calculate it and the Hall constant.