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General Thoughts: Physics (8 Viewers)

tutorhunt

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for the question where you had to draw the emf versus time, i drew the wrong graph at first. But then i crossed it out and drew a new graph with all the correct features. However i didnt use a ruler (i only realised 20seconds before end of exam), would this cost me a mark?
Did you provide some sort of way to demonstrate how the EMF got larger in the second one?
 

superSAIyan2

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^yeh. i showed that the emf doubled in the second second. and the frequency was double as well
 

tutorhunt

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yeh. i showed that the emf doubled in the second second. and the frequency was double as well
I would think it would be okay then, my first graph looked horrible, i scribbled out like 2 different lines, but in the end I think they understood
 

Jimmy2064

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I spoke about both superconductors (maglev train and mri) and semiconductors (solid state devices and solar cells) and linked their use to society x.x and I drew a line of best fit lightly, It didn't say you had to but i did it anyway just incase :s
same and same. My teacher said always draw a line of best fit, unless it says otherwise, so I did (you couldn't lose marks for it, could you?)
 

Menomaths

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What did you guys get for the AU one? The distance from Pollux or something
 

hjed

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Did you provide some sort of way to demonstrate how the EMF got larger in the second one?
I increased the amplitude and frequency of the sin graph.

for the question where you had to draw the emf versus time, i drew the wrong graph at first. But then i crossed it out and drew a new graph with all the correct features. However i didnt use a ruler (i only realised 20seconds before end of exam), would this cost me a mark?
Wasn't emf a sin graph!? You can't use a ruler for a sin graph (so you should be fine, from memory it was only two marks as well which means they probs won't take anything off for neatness)
 

Menomaths

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I increased the amplitude and frequency of the sin graph.



Wasn't emf a sin graph!? You can't use a ruler for a sin graph (so you should be fine, from memory it was only two marks as well which means they probs won't take anything off for neatness)
3 marks
 

iBibah

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i wrote
V=Ed = 0.01 x 15 = 0.15 V

b)magnetic field deflects electron down. so electric field must deflect it up. so direction of field is down.
Equate forces caused by electric and magnetic field; Eq=qvB
E = 10^4 x 0.5 = 5000 N/C downwards
But didn't it ask for the voltage? So multiply 5000 by 0.01 ?
 

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