# Electrons in a magnetic field

If you have already spent your old TV, then each of us is able to conduct a simple experiment with electrons. After all, in the tube of the television it is the electrons striking the screen with a kinescope, causing a glow.

Take a permanent magnet stronger, lift its pole to the screen. The image on the screen will turn into a spiral resembling a galaxy. If the image is curled to the right, it means that the north pole of the magnet is brought to the screen. The south pole of the magnet forms a spiral twisted to the left.

As the magnet approaches the screen, a dark ring appears against it (if the magnet is cylindrical), and in the very center there will be a light point through which the electron flux continues to go to the pole. A dark patch shows that the magnetic poles repel electrons, are directed to the equator of the magnetic field and in orbit around the magnet.

Electrons are repelled by the north and south poles. Because they are concentrated in the equatorial plane of the magnetic field in the form of a fairly flat ring, like the rings of the planet Saturn.

With the right hand grasping the magnet at the end of the north pole, hold it flat horizontally to the screen. The image on the screen is curved by an arc - up above the equator of the magnetic field. Turn the magnet with the south pole to the right - the image on the screen will bend down.

It can be seen from these experiments that the electrons rotate in a magnetic field in an orbit in a counter-clockwise direction if one looks at a magnet from the north pole. If we are dealing with positively charged particles, then, starting from the poles of the magnet, we would go in the direction opposite to the direction of the electrons along the orbit.

And what will happen if the magnet is put on bearings and irradiated with a rather powerful electron beam? Probably, the magnet starts to spin; in the flow of electrons - clockwise, in the proton flow - counterclockwise. The direction of rotation of the magnet will be opposite to the direction of twisting of the charged particles.