Electric current is flowing through a straight conductor as shown in figure given below. The direction of magnetic lines of force will be
A
Anticlockwise
B
Clockwise
C
From Bottom to Top
D
From Top to Bottom
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Propolis Cognitive Error Autopsy
Official Correct Choice:
Option A: Anticlockwise
Concept:
The direction of magnetic field lines around a straight current-carrying conductor is determined using the Right-Hand Grip Rule.
Formula:
$$\text{Right-Hand Grip Rule}$$
Solution:
According to the provided diagram, the electric current is flowing vertically upwards (\(I \uparrow\)).
Grasp the conductor with your right hand such that your thumb points upward in the direction of the conventional current.
Your curled fingers encircle the wire in an anticlockwise direction (when viewed from above).
Therefore, the direction of the circular magnetic lines of force is Anticlockwise.
Why other options are incorrect:
B (Clockwise): The magnetic field would be clockwise only if the current flowed vertically downward (\(I \downarrow\)).
C & D (Bottom to Top / Top to Bottom): The magnetic field lines form closed concentric loops perpendicular to the wire, never straight vertical lines.
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