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2014-09-09T19:22:21+02:00
B = 7 x 10^15 x 8 x 10^-8 / 5 x 10^-4
= 56 x 10 000 000 / 5 x 10^-4
= 560 000 000 / 5 x 10^-4
= 1,12 x 10^12