The shape of the magnetic field lines due to an infinite long, straight current carrying conductor is:

Question

Accepted Answer

1.  **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).
2.  **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.
3.  **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.
4.  **Conclusion:** The magnetic field lines are circular in shape.

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