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Date November 2013 Marks available 1 Reference code 13N.1.SL.TZ0.22
Level Standard level Paper Paper 1 Time zone Time zone 0
Command term Question number 22 Adapted from N/A

Question

An electron of mass me and charge e accelerates between two plates separated by a distance s in a vacuum. The potential difference between the plates is V.

What is the acceleration of the electron?

A. \(\frac{{{m_e}ev}}{s}\)

B. \(\frac{{{m_e}v}}{{es}}\)

C. \(\frac{{eV}}{{{m_e}s}}\)

D. \(\frac{V}{{{m_e}es}}\)

Markscheme

C

Examiners report

This questions proved to be somewhat difficult, especially for SL candidates. A number of different approaches could be used here, such as looking at the dimensions of the fundamental units, or by considering the cause and effect of increasing each one of the variable.

Syllabus sections

Additional higher level (AHL) » Topic 10: Fields » 10.2 – Fields at work
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