DP Physics (last assessment 2024)
Question 22M.2.HL.TZ2.7c.iii
| Date | May 2022 | Marks available | [Maximum mark: 3] | Reference code | 22M.2.HL.TZ2.7c.iii |
| Level | HL | Paper | 2 | Time zone | TZ2 |
| Command term | Determine | Question number | c.iii | Adapted from | N/A |
c.iii.
[Maximum mark: 3]
22M.2.HL.TZ2.7c.iii
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.
A small positively charged object moves towards the centre of the metal sphere. When the object is 2.8 m from the centre of the sphere, its speed is 3.1 m s−1. The mass of the object is 0.14 g and its charge is 2.4 × 10−8 C.
(c.iii)
Determine whether the object will reach the surface of the sphere.
[3]
Markscheme
«p.d. between point and sphere surface = » (53.9 kV – 7.71) «kV» OR 46.2 «kV» seen ✓
«energy required =» VQ « = 46 200 × 2.4 × 10-8» = 1.11 mJ ✓
this is greater than kinetic energy so will not reach sphere ✓
MP3 is for a conclusion consistent with the calculations shown.
Allow ECF from MP1
