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3 marksMagnetic Forces

CAPE Physics Unit 2 · May/June 2024 · Paper 2 · Question 1(d)(i)

An electron travels at 2.5 × 10^7 m s⁻¹ in a plane perpendicular to a uniform 10 mT magnetic field.

Determine an expression for the magnitude of the force acting on the electron.

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Other parts of this question

  1. 1(a)Define the term 'magnetic flux density'.[2 marks]
  2. 1(b)(i)Draw a fully labelled diagram to illustrate the direction of the force, F, acting on a straight conductor of length L carrying a current, I, at an angle, θ, to…[6 marks]
  3. 1(b)(ii)Write the expression for the force, F, experienced per unit length of the conductor in terms of B, I, L and θ.[2 marks]
  4. 1(b)(iii)Calculate the magnitude of the magnetic force experienced by the wire.[3 marks]
  5. 1(c)On Figure 1, sketch the pattern of the magnetic field around the conductor in the plane normal to the axis of the conductor.[2 marks]
  6. 1(d)(ii)Determine an expression for the radius of this path.[3 marks]
  7. 1(d)(iii)Calculate the radius of the path.[2 marks]
  8. 1(e)(i)State Lenz's law.[2 marks]
  9. 1(e)(ii)Describe a simple experiment that can be performed to demonstrate Lenz's law.[5 marks]

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