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4 marksElectric Fields

CAPE Physics Unit 2 · 2004 · Paper 2 · Question 4(c)

Four point charges (15 nC, -30 nC, 18 nC, 21 nC) arranged at the corners of a square of side 1.5 m.

Calculate the electric potential at point P located at the centre of the square. (Use Coulomb's constant 1/(4πε_0) = 9 × 10^9 N m^2 C^-2).

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Other parts of this question

  1. 4(a)(i)State THREE facts about the electrostatic force that exists between these point charges.[3 marks]
  2. 4(a)(ii)Write an expression for the electric field experienced by charge q_2 due to charge q_1.[1 mark]
  3. 4(a)(iii)Copy Figure 4a into your answer booklet and draw the resulting electric field lines. Indicate with an X the point where the resulting electric field is zero.[3 marks]
  4. 4(b)(i)Find the value of d.[7 marks]
  5. 4(b)(ii)State what assumption was made to calculate the value of d.[2 marks]

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