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Roughly how strong is the earth's magnetic field at its surface?
A3.6 x 10^-2 T
B3.6 x 10^-5 T
C3.6 x 10^-8 T
D3.6 x 10^-3 T
Answer & Solution
Correct answer: B. 3.6 x 10^-5 T
Earth's surface field is only a few tens of microtesla, about 3.6 x 10^-5 T.
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