conceptual-questions-if-a-solenoid-were-suspended-by-a-string-so-that-it-could-rotate-freely-could-i

Question

Conceptual Questions
If a solenoid were suspended by a string so that it could rotate freely, could it be used as a compass when it carried a direct current? Could it also be used if the current were alternating in direction?

Jheremiah Simon · Accepted Answer

All right, let&#x27;s consider We have a soul annoyed hanging down from a string, and we apply a direct current to it. So that means the current goes in and it&#x27;s going to flow in the same direction the whole time. So with a direct current flowing through it, this would magnetize No, let&#x27;s say we have The send is a and the current is counterclockwise looking down at the end of a and that would give us a magnetic field pointing out this way. And then it would be coming in from over here. So in this case, and even if we change the direction, as long as it was always going in that direction, you&#x27;ll have a nice magnetic field. And one end would always point towards the north or south pole of the Earth. So, yes, with a direct current, it could be used as a compass. Now, if we have an alternating current going through here, that means the currents gonna go this way and it&#x27;s going to switch and go this go back the other way. So the current will constantly be changing directions, which means our ends will constantly be changing their north and south end. So while currents going one way will have north end here in south end here. But then the currents going to switch and go back the other way, and that&#x27;s going to switch our ends again. Then we&#x27;ll get north and then we&#x27;ll get south over here. So that would not make a very good compass because it would keep flipping back and forth and you would never get anywhere.

Daniel Azubuike · Answer

Hello, Guards Soto. Question is, Is it possible toe organs are current? Loop in in a uniform magnetic field? Certain other luke move, not tend to take the The answer is yes. It is possible cause one to question the question actually gives the answer way because it say&#x27;s uniform. So for it to be uniforms, it means our any force that is produced in the magnetic field would have to be the same for that is produced at every corner off the magnetic field. Felicity, for instance. We have we have a uniform admitting field that is going in this direction. Okay, use direction. Yeah, and this is ah, uniform. So this is our magnetic field. Just call that be Ah, yes, of these times for magnetic shoot so about his B and this is actually uniform magnetic field. So the fourth over produced year or anything for the poor this year. Same for the for this year and seeing for this year and so normal in placing according to current loop for each will not be able to rotate or two sides off the off The older started off the current. All the signs off the loop must provide the same equal force How I put it in reactions of the magnetic field. So let&#x27;s see if we use and where to place. It&#x27;s a loop word about here. A little bird aboard. Here, we&#x27;re about it. So now we have on this corner this corner, discard this corner in this corner this name to corner a can be come see and on a D and canned meat. All right, so using the Flemings using the writing rule the word soon rule our rood stone for worth And but we owe using the 14 room when you point your fingers in the direction off the or the magnetic field which is B and C is the current moves from this way this way in this way that I&#x27;m selections of moving tow opposite direction and the persons are moving up with the direction as well we have to figure and like you said on the the charges would always produce a magnetic field. So I turned to figure out what force will be exacted at all the corners off a B, C D. E. Using the right hand rule and point single thing is in the Dirksen the magnetic field. You can find out that there is no force being produced here and here and also here. No, this is interesting. Part A and C are the only two corners off forces are to produce that. So, using the Flemings y 10 rule or they&#x27;re watching and rule and pointing your fingers in the direction or the magnetic field, you can say, for fact, a previous or force, and I&#x27;ll just give the force or amount off produced value less a volley off. Six. News off six now, which is in tow. The pain by using the Flemings working en route oh so close towards is into the page called, uh, into the paint. So there was a force right here, and it is also or force right here and the force of C. He&#x27;s outs off the page. Why? Using the flaming right hand room, you can put it all. You can be able to understand that the fourth sport it&#x27;s at sea. It&#x27;s actually out of the page. And since this is a uniform magnetic field, so the same force producer a be the same force produced see as well. So we have also six Milton so no using. Oh, simple. It&#x27;s in Poor problem. Seen boasting pool, Playground area where we have ah So Children of the same size, which are no, is impossible for two or two boxes of the same size being placed at both ends off the plane. And so we have In this case, we have, ah, six Newton. So six, noting and also in this case, we have 6 19 as well. So what would our core is? What is this? So forces being pursued or being personal, okay and see constantly turned out in provide a balance system. So basically this produces a bottling system for the fulcrum. So basically, that is the same situation which see So for a loop for the current Lou to be ableto not rotate, it has been placed properly. Geek alert. So the magnetic field. In order to ensure that the forces provided or the forces produce that each end off the current loop consulates or or the military ensure that there is only two points off or forced production, which is which is point A and point C and point a Priuses. This is our fourth off signals an end point C which is right here. POTUS is Oh, Ford&#x27;s off sick Newton as well. So if the forces taken 0.8 out of the page and it is taking point C into the pain, don&#x27;t we? We ensure that there is a balanced system and therefore the call the current loop doesn&#x27;t rotates.

Jheremiah Simon · Answer

all right. So let us consider a soul annoyed that is hung from the strings that it can rotate around. So come around this way and this. Illinois is just a coil. Ah, wire. And it&#x27;s a welcome back and this is where it&#x27;s attached to the string toe. Hang it. So this will be able to rotate around in the horizontal plane, which means it can spin the way it is. So it&#x27;s hanging off and it can spin in a circle. So and we have and a here and end be now if we look down this Illinois from and a all you&#x27;re going to see is like a circle. But I will say this is end A from this end are electrons are moving in a clockwise direction, so that means electrons are moving in this direction. Current, though, is the flow of positive charge. So if we&#x27;re looking at the end of a what, you will just be a circle again. So are flow of protons is in the opposite direction of these electrons. So our current I is going to be in this direction. So now to figure out which way the magnetic field is going to go. We need to apply the right hand rule. So to do that, you will take your right hand and you put your four fingers together and have your thumb sticking out, and you will curl those four fingers in the direction of the current. So if that current is flowing counterclockwise, curl your fingers counterclockwise and the way your thumb is pointing is the direction of the magnetic field. So the magnetic field is going to be coming out in this direction. So our arrows go this way this way, which means these lines will eventually wrapped back around and come in to be this way. But they&#x27;re moving in this direction. Same is the bottom. It will do the same thing. They&#x27;ll come back in moving in that direction. Now, if we look at a normal magnet with the north and and the south end here, the magnetic fields on this always go from north towards the south. So if we&#x27;re using this as an example and our magnetic field always goes from north to south, they would have to be our north end and with magnets, opposites attract. So our north end a would want to point towards the magnetic Southold

Manish Kumar · Answer

So basically, this was And we have to remind the how could you, you know, tell us a grand instead of Bernard by reading a small management&#x27;s headaches Politically, the general shape of the formality like this one, like a spring. And you basically have to, you know, get a magnet like anyone, anything like that. It&#x27;s had this one so that the current good established so But we know that fag. Hello. We&#x27;re prepared. Her love in the magnetic field or magnetic flux. Meg, No, I think plucks get changed. Then the religion used to Yemen. Hoai, he induced will generate under by this one. The induced current will also in record. So the whole morning off this one is that when we voted this bank now there will be a two engine magnetic filling the particular election or the reason, in other words, the recipient of magnetic flocks in their necks. And so basically, this is a been retained this clock, so there will be. And if the IMF and there will be a current induced current in Sacramento inside the solenoid, this is the way how we can producer current inside out fallen out on external marinating a small magnet inside a cell tonight

Mayukh Banik · Answer

generated walks by rooted in coil in magnetic field. So as long as there is relative rotation off coin and magnetic field, generator will work so we can routed the bag. Knittig Field Andi, keep the oil stationary.

Coleman Green · Answer

were asked which of these three cases could be used in. It&#x27;s an electromagnetic generator. Each is composed of ah, of a wire, which is sharing in blue with the resistor and then a magnet with a pole running through it. Polish used to spin the magnet. In the first case, the mag, the magnet is spun like this so the magnet rotates like this into and out of the page. In the second case, it rotates like this. And then in the third, in the third case, KC, the Polish stuck into the page. So the magnet is rotating around inside the page. Now, in order to be a Notre magnetic generator, it needs to induce an E M F inside the wire so the E M F is equal to the minus change in the magnetic flux over the change in time. Let&#x27;s draw the magnetic field lines for our cases. In the first case, it goes like this in the second case like this, and then the third case like this. So as it shone in case A at the start, there is no flux because all the fuel lines are parallel to the surface of the loop. But if we rotated the magnet 90 degrees so that the North Pole was pointing into the page in the South Pole pointing towards us there would be a magnetic flux. So in this case, we can change the magnetic flux. So as it rotates, the flocks will change, which means that an E m f will be generated. So case A is yes, it could be used as electromagnetic generator. Now, case be is pretty much the same thing is case A but just a rotation. Um, see, if you took if you took case A and rotated it around like this, you would get case be. But let&#x27;s just look at case be on its own. So it&#x27;s a similar thing that at, as it looks right now, there is no magnetic flux because all of the lines running parallel to the surface of the loop. But once again, if we rotated it 90 degrees, then the north polity pointing into the page the South Pole be pointing towards us and there would be a magnetic flux. So once again, the flux is changing over time, which would induce an e m f. But in case three the few minds will always be parallel to the surface of the week. You can see that they&#x27;re parallel at the moment. But if we rotated it so that the North Pole were pointing up in the South Pole were pointing down, it would resemble case A. And we said that in case A that as it shown in the picture, the magnetic field lines are running parallel to the loop, which is no flux. So no matter how we rotate the magnet in case three, there will never be a change in flocks. So in case three without a change in flocks, there is no e m f. So it would not work as an electromagnetic generator. So you have yes, for a yes for B and no mercy.

Problem

Review Questions Two charged particles are projec…

Problem 18 Medium Difficulty

Conceptual Questions
If a solenoid were suspended by a string so that it could rotate freely, could it be used as a compass when it carried a direct current? Could it also be used if the current were alternating in direction?

Answer

If the solenoid was assed Alternating current, then it cannot be used as magnet because alternating current will not magnetise the solenoid since it varies in directioon very frequently. So it cannot be used as compass.

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If the solenoid was assed Alternating current, then it cannot be used as magnet because alternating current will not magnetise the solenoid since it varies in directioon very frequently. So it cannot be used as compass.

Holt Physics

Christina K.

Andy C.

Liev B.

Marshall S.

Electric Charge

The Electric Force

Raymond A. Serway, Jerry S. FaughnHolt Physics

Christina K.

Andy C.

Liev B.

Marshall S.

Raymond A. Serway, Jerry S. Faughn

Holt Physics