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Specific Charge sum

  1. Oct 23, 2009 #1
    Hi all,

    I'm reading through a section of my course about specific charge and I cannot figure out how exactly the example sum has got the answer it displays.

    It uses carbon 12 as the example so displays the sum as:

    = 9.61305876 x 10-19
    20.08529244 x 10-27

    = 0.4786118 x 10-19+27

    = 0.4786118 x 108

    = 4.4786118 x 107 Coulombs / kg

    How exactly does it become (-19+27) when my working out of the very same sum has it at -46?

  2. jcsd
  3. Oct 23, 2009 #2


    User Avatar

    Staff: Mentor

    [tex]\frac{1}{10^n} = 10^{-n}[/tex]

    [tex]\frac{1}{10^{-n}} = 10^n[/tex]
  4. Oct 23, 2009 #3
    Thanks jtbell. :smile:

    Was funny in a way, as soon as I hit "post" the penny dropped :redface:
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