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7 marksMagnetic Forces

CAPE Physics Unit 2 · 2004 · Paper 2 · Question 5(c)

An electron is accelerated through electric potential V and enters a perpendicular constant magnetic field B, describing a circular path of radius 10 cm. Another particle with the same charge follows under the same conditions with radius of curvature 15 cm.

Determine the mass, m_x, of the second particle.

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Other parts of this question

  1. 5(a)Explain, with the aid of a diagram, Fleming's Left Hand Rule.[3 marks]
  2. 5(b)(i)Copy Figure 5 into your answer booklet and draw the path of the electron as it passes through the magnetic field. On the same diagram, draw the path if the…[3 marks]
  3. 5(b)(ii)Explain what work is done on the electron as it passes through the magnetic field.[2 marks]
  4. 5(b)(iii)Show that the path described by the electron in the magnetic field is a circle of radius r given by r = mv / (Be), where m is mass of electron and e is…[3 marks]
  5. 5(b)(iv)On the Figure 5 copied in your answer booklet, draw the path of the electron if the magnetic field B was reduced to half its value.[2 marks]

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