Physics Help Forum Across the diode

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 Aug 23rd 2008, 08:38 PM #1 Senior Member   Join Date: Apr 2008 Location: HK Posts: 886 Across the diode What is the difference between option D and E and how to determine the choice? Attached Thumbnails
Aug 24th 2008, 05:30 PM   #2

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 Originally Posted by werehk What is the difference between option D and E and how to determine the choice?
Hint: Look at where the ground is. Positive charges flow to the ground.

-Dan
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 Apr 8th 2018, 09:09 PM #3 Junior Member   Join Date: Apr 2018 Posts: 16 Sorry for necroposting, but I am curious about the answer whether is D or E. I didn't get your hint, either. Is it D since it can't get underground?
Apr 8th 2018, 09:18 PM   #4

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 Originally Posted by Monoxdifly Sorry for necroposting, but I am curious about the answer whether is D or E. I didn't get your hint, either. Is it D since it can't get underground?
The current is going clockwise in the circuit so the oscilloscope will read only positive values. So the answer is D.

-Dan
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 Apr 8th 2018, 10:33 PM #5 Junior Member   Join Date: Apr 2018 Posts: 16 Thank you. By the way, regarding necroposting, how long is the limit here?
Apr 9th 2018, 01:31 AM   #6

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 Originally Posted by Monoxdifly Thank you. By the way, regarding necroposting, how long is the limit here?
There's a limit?

-Dan
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 Apr 9th 2018, 08:41 AM #7 Junior Member   Join Date: Apr 2018 Posts: 16 Well, some forums forbid replying to an old thread with various limits. Some are three months, other two months, and others one month. In MMF it was three months.
 Apr 9th 2018, 10:56 AM #8 Senior Member     Join Date: Jun 2016 Location: England Posts: 554 NecroPosting It's rather rare that anyone can be bothered to go through the old posts on this forum. If it is not a problem (and I have never found it to be one) then there is no need to make a rule against it. __________________ ~\o/~
Apr 9th 2018, 11:34 AM   #9

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 Originally Posted by Woody It's rather rare that anyone can be bothered to go through the old posts on this forum. If it is not a problem (and I have never found it to be one) then there is no need to make a rule against it.
If I worked for a site that had an "age limit" then I would occasionally have to delete old threads. As I have not been told to do that then I must assume there isn't an age limit.

And hey, as long as the costs of keeping the data aren't outrageous some of those old problems are good ones to learn from, too.

-Dan
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Apr 9th 2018, 05:56 PM   #10
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 Originally Posted by Woody It's rather rare that anyone can be bothered to go through the old posts on this forum. If it is not a problem (and I have never found it to be one) then there is no need to make a rule against it.
Well, I like scavenging old problems in old threads, collecting some interesting problems. However when I myself can't solve it (or can't comprehend the reasoning), what else can I do other than reviving the topic?