According to the law of magnetic poles       A)  magnetic poles in a bar magnet cancel each other out.   B)  a magnetic South pole would attract a magnetic South pole.   C)  a magnetic North pole would repel a magnetic South pole.   D)  a magnetic South pole would attract a magnetic North pole.

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Bar Magnet

In physics, magnetism is a phenomenon exhibited by a magnetic substance that exerts either attractive or repulsive force. A bar magnet is either a rectangular or round and hollow fit comprised of ferromagnetic materials and has a fanciful attractive field surrounded by it.