| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.SL.TZ0.20 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 20 | Adapted from | N/A |
Question
A cell with an emf of 2.0 V and negligible internal resistance is connected across a 1.00 m length of uniform resistance wire XY. The free end of the flying lead can be connected to any position on the wire.
What is the voltmeter reading when the flying lead is connected 0.25m from end X?
A. 0.00 V
B. 0.50 V
C. 1.50 V
D. 2.00 V
Markscheme
B
Examiners report
Many candidates opted for D, failing to see that the wire is a resistance wire and will drop voltage along its length.
