International A LevelPhysicsEdexcelTopic Questions5. Thermodynamics, Radiation, Oscillations & CosmologyGravitational Fields

Gravitational Fields (Edexcel International A Level Physics)

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A helium nucleus approaches a gold nucleus. An electric force and a gravitational force act on each nucleus.

Which statement about these forces is not correct?

  • The electric force between the nuclei is repulsive.

  • The electric force is always smaller than the gravitational force.

  • Both forces increase as the nuclei approach.

  • The gravitational force between the nuclei is attractive.

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The gravitational field strength on the surface of Mercury is g subscript M.
Callisto, a moon of Jupiter, has the same radius as Mercury but only one third of its density.

What is the gravitational field strength on the surface of Callisto?

  • g subscript M over 9

  • g subscript M over 3

  • 3 g subscript M

  • 9 g subscript M

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