magnetic
When a small compass is placed in a magnetic field, the needle of the compass will align itself with the direction of the magnetic field. This is because the needle is magnetized and responds to the magnetic forces in the surrounding area.
If a magnetic compass needle is placed in a magnetic Field , its needle deflects and points in the north and south directions
Placing a magnetic compass in an electric circuit would interfere with its ability to accurately point to the Earth's magnetic north. The magnetic field generated by the electric current in the circuit would cause the compass needle to deflect from its normal orientation.
waves transfer energy
A sound wave is a disturbance that transfers energy from place to place through the vibration of particles in a medium, such as air or water.
Why not? the desert is just the same as any other place on planet earth. Magnetic compasses work fine in the desert. See the "Where does the magnetic compass not work?" question for some places where they don't work.
Using a compass is the easiest way. The needle is going to point to the Magnetic North Pole. That means that the compass needle is ALIGNED with the Magnetic Field Lines of the Earth's magnetic field at your current position.
The magnetic field can certainly be detected by a compass.The 'lines' are a handy human invention, and don't really exist, so you could not,say, trace out the lines with a compass, because they're not there.But place a compass next to a wire that's involved in any battery-operated (DC)circuit, and the compass absolutely goes crazy !
No, they do not. A wave transfers energy but the matter does not move forward with the wave.
Like magnetic poles repel, unlike magnetic poles attract. So the magnetic south and magnetic north of two bar magnets will attract. Therefore, though the compass needle points towards the magnetic north, it is actually the magnetic south pole of the compass needle that is pointing towards the magnetic north.
The compass needle is itself a magnet which is why it always points north according to the earth's magnetic field. If you place a magnet (Whose magnetic power is stronger than the earth's) close to the compass its needle will be attracted t the magnet and not to the North Pole.
by definition a wave is a disturbance that transfers energy from one place to another. a force transfers energy and creates a disturbance therefor creating a wave