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April 19, 2024, 06:53:33 pm
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Author Topic: sketching EMF graphs, Current graphs etc  (Read 4439 times)  Share 

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maxleng

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sketching EMF graphs, Current graphs etc
« on: November 13, 2007, 04:46:45 pm »
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im thinking there will be a graph sketching Q tomorrow..

im not 100% sure on this, heres a Q from the 2004 sample exam (thers no answers even on itute)



is my graph right?

also could someone PLEASE explain Q 10 2004 exam1 its another graph Q

edit: is the voltage graph just the current graph but a reflection in the x-axis?? thats what ive been told
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Galelleo

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« Reply #1 on: November 13, 2007, 04:51:37 pm »
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shouldnt that graph be a sine curve?
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Timtasticle

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« Reply #2 on: November 13, 2007, 04:53:14 pm »
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Not really. You've got the basics down - where your maximum and minimums are going to be.

But your curve should take a sine wave shape, not blocky.

Edit: Beaten to it  :oops:
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maxleng

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« Reply #3 on: November 13, 2007, 05:02:23 pm »
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oh yeah i see now, it cant really be a flat line as the flux doesn't stay constant at any time  :idea:
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Galelleo

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« Reply #4 on: November 13, 2007, 05:06:29 pm »
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exactly :D

Flux is always changing at a rate of BAcos(theta)...or is it BAsin(theta) ... so while the coil is rotating, the amount of flux is dependant on a cos... or uh sin graph.

it doesnt really matter, as long as you take 0 as 0... so probably sin graph.
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avogarbro

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« Reply #5 on: November 13, 2007, 05:20:00 pm »
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Question 11
Which one of the following statements correctly describes the effect on the pattern if the distance
between the two parallel slits is increased.
A. The pattern remains the same.
B. The bright bands move closer together.
C. The bright bands move further apart.

lisachem answers say the answer is C

People's thoughts...
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Galelleo

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« Reply #6 on: November 13, 2007, 05:22:12 pm »
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the pattern remains the same.

youre not changing gap width, nor wavelength, therefore diffraction is the same.

The only difference is the waves have further to travel before they interfere.

(this MAY mean a slight slight slight change in intensity, but not really lol)

answer is A
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Ninox

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« Reply #7 on: November 13, 2007, 05:25:53 pm »
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Quote from: "avogarbro"
Question 11
Which one of the following statements correctly describes the effect on the pattern if the distance
between the two parallel slits is increased.
A. The pattern remains the same.
B. The bright bands move closer together.
C. The bright bands move further apart.

lisachem answers say the answer is C

People's thoughts...


According to the formula: Spacing = wavelength x distance betw. screen & slits / dist. betw. slits, W=lambda x L / d

If you increase dist betw. slits, the denominator decreases, so spacing increases. Answer C
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avogarbro

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« Reply #8 on: November 13, 2007, 05:26:08 pm »
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the "distance between" the two parallel slits is increased.

If w = (lambda * Length) / (distance between slits)

increasing distance would mean w decreases, therefore the bright bands move closer together.

Is this right?
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cara.mel

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« Reply #9 on: November 13, 2007, 05:30:28 pm »
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When the flux is a maximum the volt should be 0 and vice versa.

The cos theta thing isn't in the course, and hence I never bothered to learn it xD

avogarbro - I agree with you :)
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avogarbro

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« Reply #10 on: November 13, 2007, 05:31:30 pm »
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thank you cara.mel. I wanted to make sure because ther are so many mistakes in the lisachem solutions of 2005.
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Galelleo

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« Reply #11 on: November 13, 2007, 05:31:33 pm »
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oh, maybe i was wrong ...  :oops:

never seen that formula

thnking about it practically, i cant see how the distance between the sources makes a difference :(
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cara.mel

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« Reply #12 on: November 13, 2007, 05:43:23 pm »
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Quote from: "Galelleo"
oh, maybe i was wrong ...  :oops:

never seen that formula

thnking about it practically, i cant see how the distance between the sources makes a difference :(


Cheat sheet it!
And also for single slit, 2x = lambda * l/ w (pretty similar I know, l= length to screen, w = width of slit, 2x is the central maximum because its twice as big as all the other ones) I shall go check if thats right after posting but I'm pretty sure it is
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Galelleo

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« Reply #13 on: November 13, 2007, 06:00:21 pm »
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I cant believe we havent learnt this :S:S:S
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maxleng

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« Reply #14 on: November 13, 2007, 06:20:31 pm »
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Quote from: "Ninox"
Quote from: "avogarbro"
Question 11
Which one of the following statements correctly describes the effect on the pattern if the distance
between the two parallel slits is increased.
A. The pattern remains the same.
B. The bright bands move closer together.
C. The bright bands move further apart.

lisachem answers say the answer is C

People's thoughts...


According to the formula: Spacing = wavelength x distance betw. screen & slits / dist. betw. slits, W=lambda x L / d

If you increase dist betw. slits, the denominator decreases, so spacing increases. Answer C

this is correct

i have all the possibilities and what happens when each thing changes on my 1337 sh33t  :P
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