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# Mapping of Magnetic Lines of Force

• A pictorial representation that gives the direction of the magnetic field at various points in a magnetic field is called a map of the magnetic field
• Let us now map the magnetic field by using a compass
• Fix a sheet of paper on a drawing board
• Place a bar magnet on the sheet of paper
• Trace the boundary NS of the bar magnet
• Place a compass at the North Pole
• The magnetic needle comes to rest in a particular direction
• Mark the ends of the needle. The tail end of the needle is the south pole and the tip of the needle is the north pole
• Now move the magnetic needle in such a way that its tail (south pole) always points towards the north pole of the bar magnet
• Mark the new position of its north pole
• Repeat this until you reach the other end of the magnet

• Join the points
• These points form a curve
• The curved line represents a magnetic field line or magnetic line of force
• Repeat the above procedure and draw as many lines as you can
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