This effect would be seen by carrying a compass around the earth's N magnetic pole.
The earth has lines of force which flow from its N magnetic pole, and these lines, before they can get to the earth's S magnetic pole, must spread out through the air on all sides of the earth.
Ampere's investigations had led electricians to see that the force acting upon a magnetic pole due to a current in a neighbouring conductor was such as to tend to cause the pole to travel round the conductor.
In all cases a magnetic pole of strength M, placed in the field of an electric current, is urged along the lines of force with a mechanical force equal to MH, where H is the magnetic force.
Since a magnetic pole tends to move along a line of magnetic force it was obvious that it should revolve round a wire conveying a current.
This is exactly what takes place in the rotation of a plate beneath a magnetic pole; for let N (fig.
If a single wire be moved like the spoke of a wheel near a magnetic pole, a current of electricity is determined through it from one end towards the other.
No other known power has like direction with that exerted between an electric current and a magnetic pole; it is tangential, while all other forces, acting at a distance, are direct.
The relation which holds between the magnetic pole, the moving wire or metal, and the direction of the current evolved, i.
But in the case which now occupies us, not only these three definitions are no longer in harmony, but each has lost its meaning, and in fact: 1ยบ A magnetic pole is no longer acted upon simply by a single force applied to this pole.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "magnetic pole" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
