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2 marksElectric Fields

CAPE Physics Unit 2 · 2013 · Paper 2 · Question 4(a)(ii)

Figure 3 shows a model of an electron gun accelerating electrons through a potential difference V_p.

Calculate the velocity of the electrons in the emerging electron beam when V_p = 25 kV.

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Other parts of this question

  1. 4(a)(i)By equating the gain in kinetic energy of the electrons to the work done in accelerating them, show that the velocity, v_e, of the emerging beam electrons is…[2 marks]
  2. 4(b)(i)Calculate the magnitude and direction of the magnetic field inside the solenoid.[3 marks]
  3. 4(b)(ii)a)Explain the effect on the electron's horizontal velocity component, resulting from its interaction with the B-field.[2 marks]
  4. 4(b)(ii)b)Describe the effect on the electron's vertical velocity component.[2 marks]
  5. 4(b)(ii)c)Describe the resultant motion of the electrons and the nature of the image produced on the phosphorescent screen when the B-field is large enough to prevent…[4 marks]

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