| Date | November 2013 | Marks available | 1 | Reference code | 13N.1.HL.TZ0.25 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 25 | Adapted from | N/A |
Question
A metal rod M is falling vertically within a horizontal magnetic field. The metal rod and magnetic field are directed into the paper. What is the direction of the initial force acting on the metal rod that is predicted by Lenz’s law?
Markscheme
B
Examiners report
The correct response here is B. As the rod falls, an electric current in induced, forcing the electrons across the diameter of the wire. This in turn, produces an upward force on the rod as a whole in line with Lenz’s Law.
