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UCE (O-Level) Equipotential Surfaces — practice questions

Explore 3 free Equipotential Surfaces questions in UCE (O-Level) Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Equipotential Surfaces questions and exercises with answers

Showing questions 1–3 of 3.

Two small spheres both carry negative charge and are held near each other. What do they do?Read the answer and worked solution →An isolated negative point charge sits alone in space. Which way do its electric field lines point?Read the answer and worked solution →How is the magnitude of the electric field at a point defined?Read the answer and worked solution →

Worked practice questions

Two small spheres both carry negative charge and are held near each other. What do they do?

  1. Attract each other
  2. Repel each other
  3. Ignore each other
  4. Cancel each other
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Correct answer: B. Repel each other

1. Both spheres carry charge of the same sign, so they are like charges. 2. Like charges repel each other while unlike charges attract each other. 3. The two spheres therefore push each other apart. 4. The electrostatic force between charges grows when the charges grow or the separation shrinks. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 9: Electrostatics_

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An isolated negative point charge sits alone in space. Which way do its electric field lines point?

  1. Outwards from the charge
  2. In circles round the charge
  3. Along the surface only
  4. Inwards towards the charge
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Correct answer: D. Inwards towards the charge

1. A field line shows the direction a positive test charge would move if placed at that point. 2. A positive test charge is pulled towards a negative charge, since unlike charges attract. 3. Electric field lines therefore point towards negative charges and away from positive charges. 4. Closed circular lines belong to the magnetic field around a current-carrying wire, not to an electric field. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 9: Electrostatics_

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How is the magnitude of the electric field at a point defined?

  1. The charge per unit force
  2. The force per unit charge
  3. The force per unit length
  4. The charge per unit area
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Correct answer: B. The force per unit charge

1. An electric field is a region of space in which a charge experiences a force. 2. The electric field at a point is defined as the force per unit charge. 3. This makes the field independent of how large the test charge happens to be. 4. The units that follow from this definition are newtons per coulomb. _Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 9: Electrostatics_

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ElectrostaticsNewton's lawsForceLaws of MotionElectric CircuitsElectromagnetismStatic ElectricityGeometrical optics