Professor Dave explains: Standing Waves and Harmonics

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Professor Dave: Interference, Reflection, and Diffraction

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Strobe Lights and String – Standing Waves

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Fire in ZERO-G!!

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Electroboom – Why Use AC Instead of DC at Home??

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Electroboom – Brushed DC Motors and How to Drive Them

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Three Right Hand Rules of Electromagnetism – Magnetic Force

Teaching electricity and magnetism is complicated by the challenge that the magnetic forces are perpendicular to the motion of the particles and currents.  This requires a three-dimensional perspective which can introduce a variable of a “wrong” direction.  To prevent errors, let us be “right” and use the right-hand rule.

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VCAA study design – adjusted for 2020

VCAA

Here is the updated information about adjustments made to Physics curriculum just for 2020.

https://www.vcaa.vic.edu.au/curriculum/vce/vce-study-designs/physics/Pages/Index.aspx

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Charges & fields observations

https://phet.colorado.edu/sims/html/charges-and-fields/latest/charges-and-fields_en.html

This great learning object from PhET is great tool for discussion in the Physics classroom, as well as a powerful simulation of actual values.

Here are three interesting screen shots that can be used as basis for discussions.

This first picture shows measurements of the electric field strength at 1m and 2m according to the scale.

The field strength at 1 m is given by (9×109NC2/Nm2)(1×10-9C)/(1m)2 =9N/C = 9V/m.

At 2m, having doubled the distance the field strength is only 1/4 as high ~2.25V/m

Field lines are all pointing radially outwards.

Equipotential circles (spheres in three dimensions) around the charge show the electrical potential energy of a positive charge, which will be higher closer to this positive charge.

These show a linear decrease with distance from the point charge.
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Professor Dave – Electric Charge and Electric Fields

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