DP Physics (first assessment 2025)

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Question SPM.1B.SL.TZ0.1biii

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Date May Specimen-2023 Marks available [Maximum mark: 2] Reference code SPM.1B.SL.TZ0.1biii
Level SL Paper 1B Time zone TZ0
Command term Suggest Question number iii Adapted from N/A
iii.
[Maximum mark: 2]
SPM.1B.SL.TZ0.1biii
(iii)

The theoretical relationship assumes that the ball is only affected by the electric force.

Suggest why, in order to test the relationship, the length of the string should be much greater than the distance between the plates.

[2]

Markscheme

the angle between the string and the vertical should be very small «for any position of the ball» ✓

so that the tension in the string is «almost» balanced by the ball’s weight

OR

restoring force from the string / horizontal component of tension negligibly small «compared with electric force» ✓

OWTTE

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