A-LevelPhysicsElectric fields9702/12 · Oct/Nov 2021 · Q321 Mark

A proton enters the uniform electric field between two parallel vertical metal plates in a vacuum. One plate is at a potential of 0 V and the other plate is at a potential of +10 V, as shown. [Figure 32.1] What is the initial change in the motion of the proton caused by the electric field, immediately after the proton enters the field?

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AIt begins to move downwards.

BIt begins to move upwards.

CIts speed decreases.

DIts speed increases.

✓ Correct answer

C: Its speed decreases.

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Topic: Electric fields, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Oct/Nov 2021 Paper 1 Variant 2, question 32.

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