Consider a conductor in the plane of the paper with current going from bottom to the
top. What will be the direction of the magnetic field lines to the left of the conductor?
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A.
Opposite to the direction of the current.
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B.
Perpendicular to the plane of the paper and going in.
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C.
In the direction of the current.
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D.
Perpendicular to the plane of the paper and coming out.
Correct Answer:
D. Perpendicular to the plane of the paper and coming out.
Explanation:
According to the right-hand thumb rule, if the thumb points in the direction of the current (upward), the curled fingers indicate the direction of the magnetic field. On the left side of the conductor, the fingers point away from the surface, meaning the magnetic field lines are perpendicular to the plane of the paper and directed outward. Therefore, option D is the correct answer.
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