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Human genomic DNA is around 3 billion bps. Why do we see a band around 10kb...

Human genomic DNA is around 3 billion bps. Why do we see a band around 10kb in 1% agarose gel electrophoresis? Did we do something wrong, damage the DNA and shorten it or something, what kb shall we expect to see it?

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The bands observed are of different DNA or other macromolecules which we wish to seperate using agarose gel electrophoresis.This is because different molecules have different speed of running on the gel(basically getting attracted to the electric field).This is why bands are seen.We can seperate DNA upto 25 kb by agarose gel electrophoresis.

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