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3 marksElectric Fields

CAPE Physics Unit 2 · May/June 2023 · Paper 2 · Question 1(b)(i)

Figure 1 shows an electron beam passing between charged horizontal plates, V1 and V2, and being deflected to form a spot on a fluorescent screen. All motion occurs in a vacuum. V1 and V2 are separated by 12 mm and have a potential difference of 50 V between them.

Determine the magnitude of the electric field between the plates.

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Other parts of this question

  1. 1(a)Using conventional symbols for physical quantities, complete Column 2 and Column 3 of Table 1.[10 marks]
  2. 1(b)(ii)Hence, calculate the vertical acceleration of the electrons as they pass between the plates.[4 marks]
  3. 1(c)(i)Complete Row 2 and Row 3 of Table 2.[4 marks]
  4. 1(c)(ii)On the grid provided in Figure 2 on page 9, plot a graph of negative vertical displacement versus time for the electron motion between the plates. Draw the…[4 marks]
  5. 1(c)(iii)The electrons traverse the field in 3.75 nanoseconds. Use the graph in (c) (ii) to determine how far from the horizontal axis of the plates the beam will…[1 mark]
  6. 1(d)Calculate the vertical velocity of the electron beam and hence its direction of travel on emerging from between the plates.[4 marks]

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