A straight insulated wire is laid on the laboratory floor under a layer of linoleum. How to locate a wire and the direction

A straight insulated wire is laid on the laboratory floor under a layer of linoleum. How to locate a wire and the direction of the current in it without opening the linoleum?

You can determine the location of the wire and the direction of the current in it using a magnetic arrow, because a magnetic field is formed around the conductor with current, which interacts with the field of the magnetic needle.

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