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physics

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Two long straight wires are parallel and 9.0 cm apart. They are to carry equal currents such that the magnetic field at a point halfway between them has magnitude 320 ┬ÁT.
(a) Should the currents be in the same or opposite directions?

opposite

(b) How much current is needed?

  • physics -

    a) If the currents were in the same direction in both wires, they would cancel in the middle

    b) Use Ampere's law and double the field of a single wire

  • physics -

    The current must be in the opposite direction if it has to produce some megnatic field B. B=ui/R

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