Quick questions on Electric and gravitational fields: Coulomb's law, gravitation and potential - WJEC A-Level Physics

4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are the two force laws?

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F = \dfrac{Gm_1 m_2}{r^2}

(Newton's law of gravitation)

What is potential?

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The change in potential energy moving between two points is charge (or mass) times the potential difference.

What is q1?

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Two charges of

+2.0\,\mu\text{C}

and

+3.0\,\mu\text{C}

are

0.10\,\text{m}

apart. Find the force between them. Take

\frac{1}{4\pi\varepsilon_0} = 9.0\times10^9\,\text{N m}^2\text{C}^{-2}

What is q2?

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State one similarity and one difference between gravitational and electric fields. [2 marks]

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