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 C.

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Detailed Solution

The direction of current is determined by the Right Hand Thumb rule and it would be in the upward direction.
Right-Hand Thumb rule:
If we hold the current-carrying conductor in the right hand, the thumb points in the current direction, and then the fingers encircle the wire in the direction of the magnetic field.
Question Image

From the above, it is clear that the Right-hand thumb rule can determine the direction of the current. Since the direction of the magnetic field is in the anti-clockwise direction, if we place our right hand such that the curl of our figure is in the direction of the magnetic field, i.e., in an anti-clockwise direction, then our thumb will point out in the upward direction.

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