For a magnet, monopole never exists. Whenever a magnet is broken into two pieces, two poles are created at the end of the both magnets.
When the north pole is taken near to north pole of other magnet, they exert a repulsive force on each other. While taking south pole near to the north pole of other magnet, they exert an attractive force on each other. Hence, like poles of the magnet exert repulsive and unlike poles exert attractive force on each other.
Magnetic field is represented by imaginary lines which are known as magnetic field lines. These lines represent the direction of magnetic force. For a magnet, magnetic field lines emerge from the north pole and enter into magnet via south pole. But inside the magnet, they run from south pole to north pole.
The region, in which magnetic field line are close to each other, represents the strong magnetic force while the region with the field lines far from each other represents the weak magnetic force.
Closed curves of the magnetic field lines also show that monopole of magnet never exists.
Magnetic field lines for a bar magnet can be seen in figure (1)
Moving charges also produce magnetic field around them. Applications of this property are seen in use of Solenoid, Toroid etc. Solenoid is a coil of insulated copper wire closely bound like a spring as shown in figure (2). When the current flows through the solenoid, magnetic field similar to bar magnet is set up in the solenoid. One end of the solenoid acts as the south pole while the other one acts as the north pole as shown in figure (2).
Magnetic field is uniform inside the solenoid and strength of the field decreases while moving from inside to the poles (ends) as the filed lines spread on the ends. The field lines move south pole to north pole inside the solenoid while north pole to south pole outside the solenoid similar to bar magnet.
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