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The relation between the direction of current and the direction of a magnetic field is?
Same direction
Opposite direction
Perpendicular
Unrelated
Perpendicular
Quick Trick: Remember Fleming's Right-Hand Rule or Right-Hand Thumb Rule: your thumb represents current and wrapped fingers show the magnetic field, showing they are always at 90 degrees or perpendicular to each other.
Remember Fleming's Right-Hand Rule or Right-Hand Thumb Rule: your thumb represents current and wrapped fingers show the magnetic field, showing they are always at 90 degrees or perpendicular to each other.
Identify the Governing Electromagnetic Law
According to Ampere's Right-Hand Grip Rule and Biot-Savart Law, a current-carrying conductor produces magnetic field lines that form concentric circles around it.
Determine Spatial Orientation
At any given point around the straight conductor, the magnetic field line vector is tangential to the circle, making an angle of exactly 90 degrees (perpendicular) with the direction of the electric current.
A: Same direction is incorrect because magnetic field lines circle around the current vector, not along it. B: Opposite direction is incorrect because the field vector is orthogonal, not anti-parallel. D: Unrelated is incorrect because current directly induces the magnetic field following electromagnetic principles.
C is correct because the magnetic field vector generated by a current-carrying straight conductor acts perpendicular to the direction of current flow.
Questions on basic rules like Right-Hand Thumb Rule or Fleming's Rules frequently test the 90-degree angle relationship between force, field, and current vector parameters.