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What happens to the reading on the electronic balance when current flow through the wire?
We are all familiar to applying FLHR to the current-carrying wire. But actually there is an equal and opposite force acting on the magnet too! Magnetic force is an action-reaction pair (Newton’s 3rd Law) View the video explanation What happens to the readings on the electronic balance when currents flow through the wire? https://youtu.be/6R32DsGNkic
Evan Toh
May 221 min read


Find length of copper wire Y, given both copper wires X and Y have same R.
Answer: Option D Refer to the video explanation
Evan Toh
May 201 min read


Displacement-time graph and Velocity time graph of a ball thrown and comes down - Part 03
Refer to the video for the explanation. When a ball is thrown up and it comes down, the motion varies. This video will cover how the...
Evan Toh
May 23, 20251 min read


Displacement-time and Velocity-time graph when ball is dropped and it rebounces - with energy lost - Part 02
Refer to the video below for the explanation. When a ball is dropped and it rebounces back, the motion varies. This video will cover how...
Evan Toh
May 23, 20251 min read


Displacement-time and Velocity-time graph when ball is dropped and it rebounces (no energy lost) - Part 01
Refer to the video below for explanation. When a ball dropped and then it re-bounces, the motion varies. This video will cover how the...
Evan Toh
May 23, 20251 min read


Light Reflection Experiment - Mirror and Pins - Determine the object distance and image distance.
Characteristics of mirror image: • virtual (an image which cannot be formed on a screen) • same size as object • laterally inverted •...
Evan Toh
May 20, 20251 min read


Reflection Ray Diagram - Some examples
Examples of reflection ray diagrams covered in the video.
Evan Toh
May 18, 20251 min read


Evan Toh
May 1, 20250 min read


Evan Toh
Dec 13, 20240 min read


Evan Toh
Dec 13, 20240 min read


Evan Toh
Dec 12, 20240 min read


Evan Toh
Nov 4, 20240 min read


Evan Toh
Nov 4, 20240 min read


How induced current is produced when magnet is inserted into a solenoid
According to Fraraday's Law, the magnitude of the induced emg, hence induced current, is directly proportional to the rate of change of...
Evan Toh
Nov 4, 20241 min read


Electromagnet demo
When the current flows through the solenoid, the U-shaped iron rod will become magnetised easily and strongly. When the current is cut...
Evan Toh
Nov 4, 20241 min read


Current carrying wire + compass placed below wire
When a current flows through a wire, magnetic field is produced around the wire. This magnetic field can be detected using a compass....
Evan Toh
Nov 4, 20241 min read


Overloading of a multi plug resulting in overheating and fire
It fine to use a multiplug as it brings convenience. The problem arises when too many high power appliances are connected and on at the...
Evan Toh
Nov 4, 20241 min read


Evan Toh
Nov 3, 20240 min read


Changing a 2 pin-plug to 3 pin-plug
Changing the pin will not change the voltage required by the appliance.
Evan Toh
Nov 3, 20241 min read


Simple heating element demo
The wire used here is not the typical copper wire. It is nichrome wire which has much higher resistivity compared to copper. Hence, for...
Evan Toh
Nov 3, 20241 min read
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