DP Physics (last assessment 2024)
Question 22M.2.HL.TZ2.7b
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.HL.TZ2.7b |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Determine | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
22M.2.HL.TZ2.7b
A metal sphere is charged positively and placed far away from other charged objects. The electric potential at a point on the surface of the sphere is 53.9 kV.
(b)
The electric potential at a point a distance 2.8 m from the centre of the sphere is 7.71 kV. Determine the radius of the sphere.
[2]
Markscheme
use of Vr = constant ✓
0.40 m ✓
Allow [1] max if r + 2.8 used to get 0.47 m.
Allow [2] marks if they calculate Q at one potential and use it to get the distance at the other potential.
