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Magnetic Field Units

Introduction to magnetic fields: imagine an isolated magnet situated in the empty space. It is obvious that is poles will experience no force. 

If, however, another magnet is brought in that space, then its poles will experience a force (attraction or repulsion as the case may be). Thus, the space surrounding a magnet possesses a peculiar property, which is not possessed by an ordinary empty space, of influencing other magnets. 

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 The space surrounding a magnet in which any other magnet experiences a forces id defined as the magnetic field.Magnetic lines of forceThe concept of magnetic lines of force can be understood with the help of a simple example:Spread some tiny iron filings uniformly on a glass sheet and bring a magnet below the glass sheet. 

Tap the glass sheet gently. The iron filings are found to arrange themselves along curved paths (lines). These curved lines traced by iron filings are due to the bar magnet. In the presence of the magnet, each price of iron filing becomes an induced magnet and experiences a force in a certain direction in the magnetic field. 

 Theses curved lines traced by the iron filings are called magnetic lines of force, and can be defined as fallows:A magnetic line of force is a line in a magnetic field indicates the direction along which the magnetic force acts.Or we can also tell that, A lines of force is a continuous curve in the magnetic field such that the tangent at any point of it gives the direction of the resultant field at that point. 

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 Properties of magnetic field:They always originate at the N-pole and terminate at the S-pole of a magnet.A line of force is a closed and continuous curve.The tangent to the line gives the direction of the field at that point.The lines of force do not interest with each other.