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Practice: Electron Diffraction and Microscopy

A circular section of a magnetic lens in an electron microscope is shown in the diagram. Four electrons, A, B, C, and D, travel perpendicularly to the plane of the lens section, toward the viewer.

In which of the directions I, II, III, and IV does electron A accelerate due to the magnetic force acting on it?

  • AII
  • BIII
  • CIV
  • DI
  • ENone of these directions

In which of the directions I, II, III, and IV does electron B accelerate due to the magnetic force acting on it?

  • AI
  • BIII
  • CII
  • DIV
  • ENone of these directions

In which of the directions I, II, III, and IV does electron C accelerate due to the magnetic force acting on it?

  • AIV
  • BII
  • CIII
  • DI
  • ENone of these directions

In which of the directions I, II, III, and IV does electron D accelerate due to the magnetic force acting on it?

  • AIII
  • BI
  • CII
  • DIV
  • ENone of these directions

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