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3 marksMagnetic Forces

CAPE Physics Unit 2 · 2005 · Paper 2 · Question 5(c)(ii)

Positive ions travelling at 1.6 x 10^5 m s^-1 pass undeflected through a perpendicular magnetic field of 0.15 T and an electric field in a velocity selector.

Write equations for the forces on the ions caused by the electric field and the magnetic field and hence calculate the electric field strength E.

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  1. 5(a)Explain the origin of the Hall effect, including a diagram showing clearly the directions of the Hall voltage and other relevant quantities for a specimen in…[8 marks]
  2. 5(b)A Hall probe gives a Hall voltage of 130 mV in a known magnetic field of 15 mT. Calculate the unknown magnetic field strength when the probe measures 1170 mV.[2 marks]
  3. 5(c)(i)Draw a labelled diagram to show the relationship between the two fields.[2 marks]
  4. 5(d)Calculate the velocity, v, of the strip.[5 marks]

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