A changing magnetic field passes through a wire loop but the loop itself is not in the field. Is an EMF induced in the loop?
Simple explanation to the induction from the slowly changing $\vec B$ of a solenoid in the region of $0$ magnetic field
Produce an explicit bijection between rationals and naturals? I remember my professor in college challenging me with this question, which I failed to answer satisfactorily: I know there exists a bijection between the rational numbers and the natural numbers, but can anyone produce an explicit formula for such a bijection? Story where someone gets disconnected from computers for cybercrime I read a short (in the range of 5-20 pages) science fiction story a while ago, and can't remember the title of the story or its author at the moment.  The basic story is that of a super-savvy computer hacker who got all of his knowledge of computers removed from his brain, temporarily (one year?) for cybercrime, including (IIRC) some form of identity theft, and is released into the public without any jail-time or anything. This is very hard on him, for this future-Earth relies heavily on highly interconnected computers for basic and daily needs. This is not immediately clear at the start of the story, but it becomes apparent after a little while.  Part of the story includes the main character (I don't remember if he is granted a name in the story) wanders into a cafe or a bar, and is invited to play a game of digital, . He has to turn down the invite, though, because he doesn't know and is blocked from knowing how to use computers. He also really doesn't want the other characters to know this, because apparently having your computer knowledge removed from your brain for cybercrime is a major stigma in that society. The character also has difficulty using his (futuristic equivalent of a) credit card, as that also requires some computer knowledge.  Any ideas? How to enable TRIM? I know that the Linux kernel supports TRIM as of version 2.6.33, so there should be TRIM support in ubuntu.  Is TRIM enabled by default or do I need to change some settings or install additional software for it to work? If so, how? What is color temperature and how does it affect my photography? Minecraft webpage links in chat? One post with multiple questions or multiple posts? I want to ask several questions about the same problem domain but each question is independent from the others. Should I put all the questions in a single post or should I split them and send multiple posts? Will  be supported on the Android App in the future? I visit A51 rather frequently and I would like to see it in the App. I have located where the error message originates from it is in  line number 221. As I have only a single nvidia driver installed I suspect it is is the same issue. I am not a developer but looking at the code preceding this line I can see the statement.  const char *glob_pattern = "/usr/lib/nvidia-[1-9][0-9][0-9]"  this will pick up nvidia-352/ nvidia-361/ and nvidia-361-prime/ ? on my PC. Air friction at supersonic velocities Dimensions with Rank-Nullity question $f:V \rightarrow V$, $\dim(V) = n$  a) If $n$ is odd, prove that there does not exist a linear transformation with $\operatorname{im}(f) = \ker(f)$  b) Is it false to affirm the previous statement if $n$ is even?  My answer: $$ i = \dim(\operatorname{im}(f))\\ k = \dim(\ker(f)) \begin{cases} n=2i                           &amp; \text {if $i=k$} \\ n=i+k   &amp; \text{if $n\neq k$} \\ \end{cases}  $$  b) Yes.  Is that a valid proof? Default constructor with empty brackets Is there any good reason that an empty set of round brackets (parentheses) isn't valid for calling the default constructor in C++?  MyObject  object;  // ok - default ctor MyObject  object(blah); // ok  MyObject  object();  // error   I seem to type "()" automatically everytime. Is there a good reason this isn't allowed? Any ideas how to display a PDF file in a WPF Windows Application?     I am using the following code to run the browser but the Browser.Navigate method does not do anything!  WebBrowser browser = new WebBrowser(); browser.Navigate("http://www.google.com"); this.AddChild(browser); // this is the System.Windows.Window Where do I suggest new Stack Exchange sites? Is there an appropriate place to suggest new Stack Exchange based sites, perhaps a place for them to be voted upon?  I wish there was a Stack Exchange site for Aviation (both real-life and simulated). Here is my situation: I know almost nothing about Perl but it is the only language available on a porting machine. I only have permissions to write in my local work area and not the Perl install location. I need to use the  Perl module from CPAN   How do I use this Parallel::ForkManager without doing a central install? Is there an environment variable that I can set so it is located?  Thanks  JD Meta sites in "Your Communities" display different reputation What is the word that describes the absence of bureaucracy? What is the word which describes the absence of formless, of long procedure with bureaucrats? I was thinking about formsless but it sounds weird... How can I disown a running process and associate it to a new screen shell? I have a running program on a SSH shell. I want to pause it and be able to unpause its execution when I come back.  One way I thought of doing that was to transfer its ownership to a screen shell, thus keeping it running in there.  Is there a different way to proceed? Can we get a better wording for protected questions? For context, see .  In essence:     "This question is protected to prevent "thanks!", "me too!", or spam answers by new users. To answer it, you must have earned at least 10 reputation (not including the ) on this site."   Suggested addition to existing message is in bold. Recolor Artwork: single swatch to multiple swatches I have an Illustrator document with a lot of objects. All the objects are black, same swatch.  I have a swatch group with a few dozen coloured swatches. I wish to apply these swatches to all the many black objects. It doesn’t have to be in any particular order, but each object should be coloured individually—I don’t just want to change black into some other colour, but to dozens of other colours. What I really want to avoid is having to select each object individually and then applying a different swatch to each.  I’ve never quite managed to get my head properly around the Recolor Artwork feature in Illustrator, and I cannot for the life of me get it to do anything like this. The “New” box in the Recolor Artwork dialogue box appears to accept only one colour.  Is there some way to do this using the Recolor Artwork feature? Or using some other feature that I’m not aware of? Bonus points if there’s a way to control the order in which the colours are applied; e.g., specifying an order and then click on each object in turn to apply each swatch being ‘iterated’ through in that order.  (I would prefer to avoid having to script it, but I will if there’s no other way.) Legally possible to re-create/remake an old game? Recently I started remaking an old game on Unity. Basically I want to remake an old RPG that was released for Playstation 1. I'm not ripping anything from the old game, all the assets are being created by me. I'm creating everything from the scratch, music, 3D models, gameplay however I will keep the (copyrighted ?) names, I will try to create the characters and maps/levels as they were in the original version of Playstation 1 but with better graphics.  I'm not planning on selling it or adding in on a platform like Steam (for obvious reasons, copyrights etc), just giving it for free. But I wanna know when I will finish the development, can I share the game on public with other people so they can download it?  Can the company that made the original game sue me/fine me because of copyrights reasons even though I'm not planning on selling for money?  tl;dr Remake an non-profit game of PS1 from the scratch, can the company that holds the copyrights of the game sue me/fine me?