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By convention, a magnet has a north pole and a south pole. There is nothing called a positive pole and a negative pole in magnets. Hence, options C and D are false. In the case of a magnet, the magnetic lines emanate from the north pole and enter into the south pole. Hence option A is correct. One can trace the path of magnetic lines of a magnet. For this, place the magnet on a piece of white paper and place a magnetic compass right next to the north pole and trace the path of magnetic lines. As we move the magnetic compass, we will notice that a closed loop is formed between north and south poles of the magnet. The spacing between the magnetic lines gives us an idea of the strength of the magnetic field.
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