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What is the maximum current that can carry a cable if ...?

What is the maximum current that a cable of May continue if the experimenter is a test distance of 1.0 m is the magnetic field of the Earth, which must be measured with about 1 percent? Thank you for any help!

taking only the first part, the maximum current that a cable can carry "depends on the size of the thread. I have no idea what the second part concerns ..