Question 22M.2.HL.TZ1.7c.i
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.HL.TZ1.7c.i |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | c.i | Adapted from | N/A |
Two identical positive point charges X and Y are placed 0.30 m apart on a horizontal line. O is the point midway between X and Y. The charge on X and the charge on Y is +4.0 µC.
A positive charge Z is released from rest 0.010 m from O on the line between X and Y. Z then begins to oscillate about point O.
Identify the direction of the resultant force acting on Z as it oscillates.
[2]
force is towards O ✓
always ✓
Many candidates were able to identify the direction of the force on the particle at position Z, but a common error was to miss that the question was about the direction as the particle was oscillating. Examiners were looking for a clear understanding that the force was always directed toward the equilibrium position, and not just at the moment shown in the diagram.
