physics

The magnitude of the magnetic field produced by a long straight current-carrying wire is:


proportional to both the current in the wire and the distance from the wire

proportional to the current in the wire and inversely proportional to the distance from the wire

inversely proportional to the current in the wire and proportional to the distance from the wire.

inversely proportional to both the current in the wire and the distance from the wire.

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  1. THINK !!!
    B goes up when current goes up, that is what causes B
    gets weak when you get away from wire of course.
    so the second choice

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