The shape of the magnetic field lines due to an infinite long, straight current carrying conductor is:
A
a straight line
B
circular
C
elliptical
D
a plane
Step-by-Step Solution
Identify Principle: The pattern of the magnetic field produced by a straight current-carrying conductor is determined using the Right-Hand Thumb Rule (or Right-Hand Grip Rule).
Apply Rule: If you imagine holding the conductor in your right hand with the thumb pointing in the direction of the current, the fingers will curl around the conductor.
Determine Shape: The direction of the curled fingers represents the direction of the magnetic field lines. These lines form concentric circles centered on the conductor and lying in planes perpendicular to the conductor.
Conclusion: The magnetic field lines are circular in shape.
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