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(D) According to the Right-Hand Thumb Rule for a circular current-carrying loop,if the fingers of the right hand are curled in the direction of the cu

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north pole

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(D) According to the Right-Hand Thumb Rule for a circular current-carrying loop,if the fingers of the right hand are curled in the direction of the current,the thumb points in the direction of the magnetic field lines inside the loop.If the current flows in an anticlockwise direction when viewed from the top,the magnetic field lines point upwards (towards the observer).Since magnetic field lines emerge from the North Pole,the face of the loop where the current appears anticlockwise acts as a North Pole.Conversely,if the current flows in a clockwise direction,the face acts as a South Pole.Therefore,the upper side of the loop acts as a North Pole if the current is anticlockwise.

Curl the palm of your right hand around the circular wire with the fingers pointing in the direction of current and the thumb gives the direction of the magnetic field. In this case,the upper side of the loop may be thought of as

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