DP Physics (last assessment 2024)
Question 21M.2.HL.TZ1.b.iii
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.HL.TZ1.b.iii |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Identify | Question number | b.iii | Adapted from | N/A |
b.iii.
[Maximum mark: 1]
21M.2.HL.TZ1.b.iii
A device sends an impulse of electrical energy to maintain a regular heartbeat in a person. The device is powered by an alternating current (ac) supply connected to a step-up transformer that charges a capacitor of capacitance 30 μF.
The voltage across the primary coil of the transformer is 220 V. The number of turns on the secondary coil is 15 times greater than the number of turns on the primary coil.
Identify, using the label + on the diagram, the polarity of the capacitor.
[1]
Markscheme
labels + on the lower side of the capacitor ✓
