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Help with this multiple choice fields and forces question

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The gravitational field strength is equal to the negative potential gradient of the gravitational field. From the plot, the potential gradient at point P is about -10 J/kg per 2m, or -5 J/kg per m. So the field strength at that point is 5 N/kg.

The direction of the potential gradient is to the left so, as you deduced correctly, the direction of the field is to the right.

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