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The Strength of a Gravitational Field.

The path which a small 'test' mass placed in a gravitational field is called a field line. It is a line of force directed radially towards the centre of the planet.The strength of a gravitational field - g - is the force per unit mass on a small test mass placed in the field.

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Specification: Edexcel Physics (9PH0), A-level, Topic 12: Gravitational Fields, statements 174 and 175. Topic: Gravitational Fields.

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