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A singly charged heavy ion following a circular path in a uniform magnetic field of magnitude 0.053 T is observed to complete five revolutions in 1.58 ms. Calculate the mass of the ion.

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Shouldn't the centripetal force equal the magnetic force, so:

qvB = ((m)(v)(v))/r

and then I could solve for m?

My problem is that I don't know what "singly charged heavy ion" means in terms of the charge. Does that give me the charge? There's no explanation of this term in the book.

Thanks for any help!