If the direction of current in a straight conductor is reversed, what will be the effect on the direction of the surrounding magnetic field lines?

Question

If the direction of current in a straight conductor is reversed, what will be the effect on the direction of the surrounding magnetic field lines? — Exam MCQ

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D. The magnetic field lines will reverse direction — The correct choice is The magnetic field lines will reverse direction. The result follows from the relevant magnetic-field, electromagnetic-induction or Fleming/right-hand-rule principle.

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A. The magnetic field lines will become weaker

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B. The magnetic field lines will remain unchanged

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C. The magnetic field lines will become stronger

If the direction of current in a straight conductor is reversed, what will be the effect on the direction of the surrounding magnetic field lines?

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