Question: A long, East-West oriented power cable carrying an unknown current I is at a height of 8 m above the Earths surface. If the magnetic

A long, East-West oriented power cable carrying an unknown current I is at a height of 8 m above the Earth’s surface. If the magnetic flux density recorded by a magnetic-field meter placed at the surface is 15 μT when the current is flowing through the cable and 20 μT when the current is zero, what is the magnitude of I?

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