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3 marksElectrical Quantities

CAPE Physics Unit 2 · 2006 · Paper 2 · Question 4(b)(ii)

A cylindrical proton beam of kinetic energy 5.0\text{ MeV} and radius 1.5\text{ mm} is aimed at a target with current 0.50\text{ mA}.

Calculate the number density of protons in the beam.

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Other parts of this question

  1. 4(a)(i)Explain the term 'drift velocity'.[2 marks]
  2. 4(a)(ii)Define the 'coulomb' and the 'volt'.[2 marks]
  3. 4(a)(iii)Figure 4 shows electrons moving through a cross section of a wire. Show that the current, I, through the wire is given by I = nevA.[4 marks]
  4. 4(b)(i)Calculate the velocity of the protons.[3 marks]
  5. 4(b)(iii)Calculate the number of protons hitting the target in 1 second.[3 marks]
  6. 4(c)The beam of protons in (b) is to be deflected around a curve of radius 2.0\text{ m}. If the magnetic field is perpendicular to the beam, calculate its field…[3 marks]

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