Ionisation of Air to Remove Static Electric Charges
Materials Wool PVC pipe or plastic comb String Lighter Procedure Hang the string from an elevated position. Leave the bottom end free. Rub the PVC pipe with wool. This deposits...
February 2013
Magnetic Shielding
Materials Bar magnet Paper clip (stainless steel) Plastic clipboard Steel bookend Procedure Before the demonstration, make sure that the paper clip is not already magnetised by...
Heat Capacity of Water
Water has a high specific heat capacity of about 4200 J kg -1 K -1 . When a little bit of water is placed in a balloon, it is able to absorb a significant amount of heat from a...
Homopolar Motor 2
This video demonstrates how a simple homopolar motor is made using a screw and a small neodymium magnet. The simplest possible motor one can make, it can be used to teach concepts...
Electromagnetism Lecture
I enjoy lecturing on topics like Superposition and Electromagnetism in the GCE A-level syllabus as they lend themselves well to the use of fun demonstrations that I can perform in...
Measuring the Force on a Current-Carrying Conductor
The force acting on a current-carrying conductor is given by $$F =BIl sin \theta$$ where B is the magnetic flux density, I is the current, l is the length of the wire and $\theta$...