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What is magnetic field lines? List three characteristics of magnetic field lines. Describe an experiment to show the magnetic lines.

Dear Student,

Magnetic field lines are the lines which are formed in a region of magnetic effluence. e.g concentric magnetic lines near a straight conductor carrying current, near a magnet etc.

Characteristics of magnetic field lines 
They are closed and continuous
They move from north pole to south pole outside the magnet
They move from south to north pole inside the magnet
They never intersect each other  

To study the magnetic field lines due to a current carrying circular coil is    
Take a circular coil on a table and fix it with a battery and a key.
Allow the current to pass 
Sprinkle iron fillings on the table near the circular coil
The iron filings take the shape of concentric lines near the coil and and parallel at the center due to the influence of both the current carrying coils
This formed lines tells us about the magnetic lines formed. 

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it is a pictorial representation of the magnetic field around a conductor.
  *they do not intersect
  *THEY GO FROM NORTH TO SOUTH
  *MAGNETIC FIELD AT ANY PONT GIVES THE MAGNETIC FIELD OF THAT POINT.
RIG
HT HAND THUMB RULE
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