That shows the magnetic field at work protecting us from these highly energetic particles.
On the other hand, the moon is small and without an atmosphere or a magnetic field to deflect solar radiation.
The difference between the rate of rotation of the rotor and that of the magnetic field is called the "slip."
It is this magnetic field of the current that causes the needle to turn.
But how can a magnet, not subject to a varying current, change its magnetic field?
It may be produced by a single coil rotating in a magnetic field.
Thus the supply of electricity to the plate has been entirely stopped by the magnetic field.
It is not necessary that the magnetic field be created by a permanent magnet.
Now they're trying to make it come out right by allowing for the effect of the earth's magnetic field on a metal meteorite.
The magnetic field surrounding a bar magnet is shown in Fig. 2.
|magnetic field |
A magnetic field is said to exist in a region if a force can be exerted on a magnet. If a compass needle is deflected when it is put at a particular location, we say a magnetic field exists at that point, and the strength of the field is measured by the strength of the force of the compass needle. The Earth, the sun, and the Milky Way galaxy all have magnetic fields. All known magnetic fields are caused by the movement of electrical charges. Electrons in orbit in atoms give rise to magnetic fields, so that every atom is, like the Earth, surrounded by a magnetic field. (See magnet and magnetism.)