Imagine a current-carrying straight conductor with magnetic field of l

Imagine a current-carrying straight conductor with magnetic field of lines in anti-clockwise direction. Then the direction of current is determined by

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the Right-Hand Thumb rule and it would be in the downward direction.

the Left-Hand Thumb rule and it would be in the downward direction.

the Right-Hand Thumb rule and it would be in the upward direction.

the Left-Hand Thumb rule and it would be in the upward direction.

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC NDA-2 – 2021

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The direction of the magnetic field around a straight current-carrying conductor is determined by the Right-Hand Thumb Rule (also known as Ampere’s Right-Hand Rule). According to this rule, if you point the thumb of your right hand in the direction of the conventional current, your fingers curl in the direction of the magnetic field lines around the wire. The question states the magnetic field lines are in an anti-clockwise direction when viewed from a certain perspective (presumably from above the conductor). If the current were downwards, using the right-hand rule, your fingers would curl clockwise. If the current were upwards, your fingers would curl anti-clockwise. Since the magnetic field is anti-clockwise, the current must be in the upward direction, and the rule used is the Right-Hand Thumb rule.

The Right-Hand Thumb Rule for a straight conductor states: Point your right thumb in the direction of the conventional current. Your fingers curl in the direction of the magnetic field. An anti-clockwise magnetic field (when looking down onto the wire) implies the current is flowing upwards.

The Left-Hand Rule is typically used in contexts involving forces on current-carrying conductors in magnetic fields (Fleming’s Left-Hand Rule) or for the direction of force on a moving charge in a magnetic field. For determining the direction of the magnetic field created by a current, the Right-Hand Rule is used.

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