Magnetic Field

The space around a magnet within which the influence of the magnet can be predicted, is called magnetic field.
We can visualize or map a magnetic field with a small free to rotate magnetic needle. If we place the said magnetic needle in front of the North Pole of a bar magnet, the north end of the needle will face outwards from the North Pole of the bar magnet. If we push the magnetic needle towards the direction of the north end of the needle, the alignment of the needle will change further towards the South Pole of the magnetic bar. If the needle further proceeds along the alignment of north head of the needle, again the alignment of the needle is further changed towards the magnetic South Pole of the bar.

In this way if we move the magnetic needle and follow the alignment of needle head at each position of the needle, we will find that the needle will ultimately comes to the south pole of the magnetic bar following a typical curvature path. magnetic field predicted by compass This path of travelling a magnetic needle following the alignment of needle itself, from North to South Pole of a bar magnet is referred as magnetic lines of force. There are possibilities of number of such magnetic paths in a magnetic field as shown below. magnetc field

We can map a magnetic field by using iron filings. Here, we keep a bar magnet below a horizontally placed card board. Now we will sprayed fine iron flings on the card. We will find that, the iron filings set themselves in the form of curve chains between north and south pole of the bar magnet. This curve chains of iron filings indicate the lines of force of the magnetic field of the bar magnet. magnetic field predicted by iron filings The lines of force is the line on which if we place a magnetic north pole it will experience the magnetic force in the direction along the tangent drawn on curve (lines of force) on that point. We can also define the line of force as a curve, along which a free to move unit north pole travels from north pole to south pole of a magnet due to influence of magnetic field.


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