A thin 12 cm long solenoid has a total of 390 turns of wire and

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Physics
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Question description

A power line carries a current of 70 A along the tops of 7.5 m high poles. What is the magnitude of the magnetic field produced by this wire at the ground?

How does this compare with the Earth's field of about 1/2 G?

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(Top Tutor) Daniel C.
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