Dedicated to those who never had the opportunity to receive a good education
Dedicated to those who never had the opportunity to receive a good education
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# Maxwell equations in matter

By J.P. Mizrahi | Electricity and Magnetism

The Maxwell equations are a set of four partial differential equations that describe the spatial and temporal behavior of electric and magnetic fields. The sources of time-independent electric and magnetic fields are the time-independent electric charge density and the steady current density respectively. The study of electric and magnetic phenomena that do not vary in

# Force and acceleration in special relativity

By J.P. Mizrahi | Special Relativity

Acceleration in special relativity is not parallel to the applied force. This is in contrast to the case of classical mechanics where Newton’s second law implies that force and acceleration are parallel by definition. In the present article, this result is derived in a simple form. Force in special relativity Recall that in special relativity

# Energy threshold for creation of particles in relativistic collisions

By J.P. Mizrahi | Special Relativity

In the present article, we consider the collision of two particles , and , with at rest in the lab frame of reference before the collision. As a result of the collision one or more particles , are produced. The produced particles can be, in principle, different from the colliding ones. Such kind of reaction

# Lorentz transformations

By J.P. Mizrahi | Special Relativity

In the present article, the Lorentz transformations of the space-time coordinates, velocities, energy, momentum, accelerations and forces, are presented in a condensed form. It is explained how the Lorentz transformation for a boost in an arbitrary direction is obtained, and the relation between boosts in arbitrary directions and spatial rotations is discussed. The case when

# How Einstein got the equation ?

By J.P. Mizrahi | Special Relativity

The equation is probably one of the most famous equations in the history of the physics, and its meaning has been amply discussed. However, it is generally unknown how Einstein got this beautiful result. In the present post I will show you a derivation of this equation.

# The electric field of a point charge surrounded by a thick spherical shell

By J.P. Mizrahi | Electricity and Magnetism

In the present post I will consider the problem of calculating the electric field due to a point charge surrounded by a conductor which has the form of a thick spherical shell

# Applications of the Gauss law to electrostatic

By J.P. Mizrahi | Electricity and Magnetism

I will start with some conventional problems which are relatively easy, and after that, I will consider more advanced problems. I will show you how to solve some problems that seem to be challenging.

# Electric dipole and electric dipole potential. An introduction.

By J.P. Mizrahi | Electricity and Magnetism

The concepts of electric dipole, potential of dipole, pure and physical dipoles are explained.

# Moment of inertia, definition and examples

By J.P. Mizrahi | Mechanics

The moment of inertia of a rigid body is clearly defined and explicit calculations for a thin rod or stick, a cylindrical shell and a disk, are made.

# The Simple Harmonic Oscillator

By J.P. Mizrahi | Mechanics

The one-dimensional simple harmonic oscillator is described by the differential equation (1)   Here is the mass of the particle and is the constant characterizing the restoring force. Solution of the simple harmonic oscillator The solution satisfying the initial condition , where is the amplitude of the oscillations, is given by (2)   The oscillator