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Skanda_6813
#1 Posted : Wednesday, July 07, 2021 1:51:00 PM
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Hello!

I had a quick question related to ICE 4:

1. For Question 78, how did we know to use cos rather than sin in the formula? Does it go back to basic trig or is it something I need to memorize?

Also, regarding Faraday's law, what are some things that can cause a change in magnetic flux (and induce current)? Do I need to know them or is that too advanced?

Thank you so much for your help!
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INSTR_Katrina_128
#2 Posted : Monday, July 12, 2021 3:14:55 PM
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Q78: When you move against (parallel) to an electric field, it's like trying to swim AGAINST the tide -- it's really hard! But, if you move PERPENDICULAR to the field, that's the same as swimming PERPENDICULAR to the tide -- not hard!

We can mathematically calculate how much we are swimming AGAINST (parallel) and PERPENDICULAR TO the electric field using cosine. We've seen similar formulas on page xxxiii for work and power.

So, the best answer is qED cos Θ.

Faraday's Law: The math for Faraday's law gets pretty wonky, which is why we don't delve too deeply into it. It's what allows us to generate power and run all of our electrical stuff. Yeah, science!

To answer your question: to increase the produced amount of magnetic flux, you can do a few things:

- increase the number of coils
- increase the magnetic field strength (i.e. use a stronger magnet)
- increase the surface area of the magnet
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