## Building a Simple DC Motor

Using material that is easily available, you can 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 clips neodymium magnet 1.5V AA battery plastic or wooden block (I used a 4x2 Lego

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## 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 plastic ruler, a steel ruler, a steel bookend, and some coins of different alloys. It

https://physicslens.com/video-on-magnetic-shielding/

## Simulation: Faraday's Law of Induction

This simulation traces the flux linkage and corresponding emf generated by a rectangular coil rotating along an axis perpendicular to a uniform magnetic field. One is able to modify the angular frequency to see the effect on the frequency and peak emf generated. https://physicslens.com/simulation-faradays-law-of-induction/Follow

## Simulation: How emf is generated

This simulation is really more of an animation that allows students to apply Fleming's left hand rule on a line of electrons along a conductor cutting a magnetic field in order to appreciate how emf is generated. https://physicslens.com/simulation-on-emf-generation/Follow

https://physicslens.com/simulation-on-emf-generation/

## DeLight Version 2

I modified "DeLight", the board game that I designed a few years back into a worksheet version (for small groups) as well as a powerpoint version (that teacher can facilitate as a class activity, pitting half the class against another). Worksheet: DOWNLOAD Slides: DOWNLOAD The objectives of the game is to reinforce concepts related to

https://physicslens.com/delight-version-2/

## Concrete to Abstract

As I was teaching the use of the potential divider equation to my IP4 (Grade 10) students last week, I approached it by teaching the rules first before showing worked examples. Thereafter, as some students remained confused, I merely reverted to explaining the rules. Eventually, I resorted to simplifying the equation by substituting simple numerical

https://physicslens.com/concrete-to-abstract/

## Phase Difference Simulation

I created this simulation for use later this semester with my IP4 classes, to illustrate the concept of phase difference between two oscillating particles. https://physicslens.com/phase-difference-simulation/Follow

https://physicslens.com/phase-difference-simulation/

## Using a mobile phone in a petrol station.

So it's safe to use a mobile phone in a petrol station. But not wearing nylon. For more on this, read the Straits Times article : http://www.straitstimes.com/asia/se-asia/use-of-mobile-phones-at-petrol-stations-do-not-cause-fires-experts https://physicslens.com/using-a-mobile-phone-in-a-petrol-station/Follow

https://physicslens.com/using-a-mobile-phone-in-a-petrol-station/

## Explanation for Water Bending with Static Electricity

It's interesting to note the differing views regarding the explanation for how a thin stream of water can get bent when a charged object is placed near it. It started with these two videos from Veritasium: This video then sets out to disprove Veritasium's model of ions being removed from the water stream. https://physicslens.com/explanation-for-water-bending-with-static-electricity/Follow

https://physicslens.com/explanation-for-water-bending-with-static-electricity/

## Simulation for Gravitational Field Strength and Potential

This simulation allows students to observe the variation of gravitational field strength and potential between two masses. Field strength is shown as vectors whereas potential is shown as scalar values on a plot. The resultant field strength and potential are shown in red. https://physicslens.com/simulation-for-gravitational-field-strength-and-potential/Follow

https://physicslens.com/simulation-for-gravitational-field-strength-and-potential/