31st of March's Class
We begin the class by observing the behaviour of an electric field through this website. We can see the direction of the forces and the path that the electrical field takes depending on the position and number of charges that are present within a given space. The image below is a hand-drawn depiction of what it looked like.
The professor then bring out an apparatus named Faraday's Cage. Its picture is shown below:
The part of the apparatus circled in blue, will be generating charges that will be passed onto the cylindrical cage to the left, circled in green, through a conductor. This will cause the cage to have a build up of charges, and we were supposed to make a guess on how the aluminium foils attached to the cage would react after receiving the charges.
My prediction that both the aluminium foils on the outside and inside would be repelled was off. What happened was that only the aluminium foils on the outside of the cage is repelled. The charges of the cage would only gather on the outer circumference of the cylindrical cage. The image below is an illustration of what happened.
The aluminium foils on the outside are drawn with black markers, while those drawn in blue markers are in the internal circumference of the cylindrical cage.
The image above is an illustration and an explanation on what is going on in this process.
We were then given a hypothetical question: If there was a lightning storm, and we are stuck in the forest, what would be the best course of action to take? The image below is the answer that we came up with:
The answer in red is the true answer.
We were given a series of question for us to understand the relationship between the function of radius and surface area and volume through derivation.
The following image is our attempt at answering them:
After that, we answered a series of questions that relates the electric field of a point charge with the radius of a sphere.
The image below is our attempt at answering them
The professor then brought out a microwave, and placed a number of items into it. The first one is an aluminium wool. The image below shows the set up prior to the demonstration. The aluminium wool is circled in pink.
The interesting part to note from the demonstration is that the sparks emitted are from the tips of the wool, which shows that the earlier explanation that charges accumulate at the ends of the wool is true.
Professor Mason also placed a CD into it
We then worked on a question that asks us to relate charge with the elements of a cylinder.
The image below is our attempt at answering it:
And we ended the class with a question that describes Electric Field's analogous relationship with Gravitational Field
This is our attempt at answering the question:
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