Magnetic Force on a Current-Carrying Conductor

Using a neodymium magnet, some paper clips and a battery, you can demonstrate the magnetic force acting on a current-carrying wire while recalling Fleming’s left-hand rule. Using the same frame constructed in the previous video, you just need to add… Continue Reading

Building a Simple DC Motor

Using material that is easily available, you canĀ build a simple homopolar D.C. motor (one that uses a single magnetic pole. I made the video above to help you do so. The material used are as follows: insulated copper wire paper… Continue Reading

Magnetic Shielding

I made this rather simple video this morning showing a physics demonstration on the effect of magnetic shielding. A paper clip is shown to be attracted to a magnet. A series of objects are placed in between, such as a… Continue Reading

Diamagnetism

I didn’t want to spend money on buying a piece of pyrolytic graphite and large neodymium magnets so I made do with what I have to make the following video. While diamagnetism is not in the A-level physics syllabus, it’s… Continue Reading

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 touching it with the steel bookend. If it gets attracted to the bookend, get… Continue Reading

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 at various levels. For lower secondary students, they… Continue Reading

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 front of the audience. One of the recent demonstrations that… Continue Reading

Homopolar Motor 1

A homopolar motor is a simple electric motor that does not require the use of a commutator. The electric current flows in a fixed direction within the wires of the motor. The following are instructions on how to construct this… Continue Reading

Electromagnet

Materials Insulated wire (about 1 m in length) Iron nail (at least 5 cm in length) 1.5 V battery Adhesive tape Small metal paper clip Procedure Test that the iron nail is not already magnetised by trying to pick up… Continue Reading

Oersted’s Experiment

Hans Christian Oersted showed that an electric current can affect a compass needle in 1820. This confirms the direct relationship between electricity and magnetism, which in turn, paved the way for further understanding of the two. The direction of the… Continue Reading