DP Physics (last assessment 2024)

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Question 21M.2.HL.TZ2.c

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Date May 2021 Marks available [Maximum mark: 3] Reference code 21M.2.HL.TZ2.c
Level HL Paper 2 Time zone TZ2
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 3]
21M.2.HL.TZ2.c

A vertical wall carries a uniform positive charge on its surface. This produces a uniform horizontal electric field perpendicular to the wall. A small, positively-charged ball is suspended in equilibrium from the vertical wall by a thread of negligible mass.

The thread breaks. Explain the initial subsequent motion of the ball.

[3]

Markscheme

horizontal/repulsive force and vertical force/pull of gravity act on the ball ✓

so ball has constant acceleration/constant net force ✓

motion is in a straight line ✓

at 30° to vertical away from wall/along original line of thread ✓

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