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3 marksElectrical Quantities

CAPE Physics Unit 2 · 2019 · Paper 2 · Question 1(a)(ii)

This question explores fundamental concepts of electricity, including definitions of electrical units, Coulomb's Law, and the behavior of electrons in a parallel plate capacitor.

Define the term 'coulomb' and state its relationship to the elementary physical unit of charge.

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Other parts of this question

  1. 1(a)(i)Define the term 'volt'.[2 marks]
  2. 1(b)In the equation for Coulomb's law, F = Q₁Q₂ / (4πε₀R²), state the meaning of EACH symbol and its corresponding SI unit.[5 marks]
  3. 1(c)A +100 µC and a test charge of -5 µC are 3 mm apart. Calculate the forces between them.[4 marks]
  4. 1(d)(i)For those electrons which are ejected at right angles to the lower plate, calculate the MAXIMUM initial energy, in joules, they can have if none of them reach…[3 marks]
  5. 1(d)(ii)Determine the MAXIMUM initial velocity of the electrons in (d)(i).[3 marks]
  6. 1(d)(iii)Calculate the acceleration of the electrons in (d)(i).[5 marks]
  7. 1(e)(i)Draw a tangent to the graph in Figure 2 and measure the angle of ejection.[3 marks]
  8. 1(e)(ii)Read off the MAXIMUM height reached from the lower plate.[1 mark]
  9. 1(e)(iii)Read off the distance travelled parallel to the plate before being re-absorbed.[1 mark]

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