IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: gaurav95 on May 04, 2010, 04:07:09 pm
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Chem:- What is halide and halogenation
Phy:-Where do we use left hand rule and Right hand rule(Flemming's)?Can somebody give me some e.g.s on that thx
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A halide ion is a a group 7 ion.
Like chloride Cl- is a halide ion.
Halogenation is basically a substitution reaction between an alkane and any free radical halide.
For example methane reacts with chlorine free radical to form chloromethane and hydrogen chloride.
The essential condition is UV light.
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Yea I want to know the same thing for Phy, I don't get it lol
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thuMb represents the motion
Forefinger represents the field
Central finger represents the current..
look at the capital letters...M F C ...motion,field,current..
Right hand rule is used to find the direction of the current in a generator.
Left Hand rule to find the direction of the motion of the wire in a motor.
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Left hand rule is applied when current causes motion
Right hand rule is applied when motion causes current...
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Examples please?
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thuMb represents the motion
Forefinger represents the field
Central finger represents the current..
look at the capital letters...M F C ...motion,field,current..
Right hand rule is used to find the direction of the current in a generator.
Left Hand rule to find the direction of the motion of the wire in a motor.
I am sorry to ask this qs but are you sure about your answer :o :o :o :o :o :o :o :o
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I am sorry to ask this qs but are you sure about your answer :o :o :o :o :o :o :o :o
yes, very sure
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Question 9 C ii
Why does the wire move towards the thick rigid one ? PLEASE READ THE BELOW PARAGRAPHS FIRST
If the current is flowing down both wires there is a magnetic field going clockwise IN BOTH WIRES, hence shouldnt they deflect ?
OR is it a rule that mag fields that move in the same direction (clockwise/anticlcokwise) interact and hence cause an ATTRACTION
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Ok this is tricky, i have to use the image to explain, answer in next post.
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Ok this is tricky, i have to use the image to explain, answer in next post.
Thanks man. :)
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Refer to the diagram attached herewith.
The orange line indicates the magnetic field. As u can see it is in a circular form, Now, here u have to use the flemming's left hand rule.
However, as the magnetic field is in circular form u have to choose one point to apply the Left hand rule. The red point marken on the line T3-T4 is that point. (Note - the red point shudve been on the wire (T3-T4), it didnt come up in the image, sry abt that)
Okay, so at that point, the magnetic field is pointing in the direction of the blue arrow (consider it as a tangent to the circle)
The brown arro indicates the current.
If u arrange ur left hand in this form u will see the movement of the wire is towards the thick rigid wire as ur thumb points towards it.
im not sure abt this, astar plz check. thanks
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Refer to the diagram attached herewith.
The orange line indicates the magnetic field. As u can see it is in a circular form, Now, here u have to use the flemming's left hand rule.
However, as the magnetic field is in circular form u have to choose one point to apply the Left hand rule. The red point marken on the line T3-T4 is that point. (Note - the red point shudve been on the wire (T3-T4), it didnt come up in the image, sry abt that)
Okay, so at that point, the magnetic field is pointing in the direction of the blue arrow (consider it as a tangent to the circle)
The brown arro indicates the current.
If u arrange ur left hand in this form u will see the movement of the wire is towards the thick rigid wire as ur thumb points towards it.
im not sure abt this, astar plz check. thanks
Dude, that was an A 1 explanation. Short and sweet, the way I like it. Thanks alot understood it completely . I'd +rep you but I have to spread the love :D
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Thanks, dont worry abt the rep. Dude, one confusing thing here.
As both the wires are conducting current, both will have their magnetic field, thus u may ask, y is the magnetic field of the thicker wire taken into consideration. I think this is because the thicker wire will have less resistance, and thus more current which makes the magnetic field stronger.
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i didn't get the blue aroow thing :(
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its the direction of the magnetic field at THAT POINT . the reason i stress on the point is because the magnetic field is circular and the blue line is the tangent to that circle.
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@A@di - i understood the question finally ..lol :D thx!!!!
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its the direction of the magnetic field at THAT POINT . the reason i stress on the point is because the magnetic field is circular and the blue line is the tangent to that circle.
Thanks for all your explanations
I'd + rep for that
In the q above how did u determine the direction of magnetic field???????????
but as a i said can u give more e.g.s thx
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Thanks for all your explanations
I'd + rep for that
In the q above how did u determine the direction of magnetic field???????????
but as a i said can u give more e.g.s thx
The mag field always flows from North pole to South pole, so your index finger points from North towards the south pole.
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The mag field always flows from North pole to South pole, so your index finger points from North towards the south pole.
I know that but where are the S and North poles and Examples pls
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I know that but where are the S and North poles and Examples pls
They will be shown
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The orange line indicates the magnetic field. As u can see it is in a circular form, Now, here u have to use the flemming's left hand rule.
However, as the magnetic field is in circular form u have to choose one point to apply the Left hand rule. The red point marken on the line T3-T4 is that point. (Note - the red point shudve been on the wire (T3-T4), it didnt come up in the image, sry abt that)
Okay, so at that point, the magnetic field is pointing in the direction of the blue arrow (consider it as a tangent to the circle)
The brown arro indicates the current.
If u arrange ur left hand in this form u will see the movement of the wire is towards the thick rigid wire as ur thumb points towards it.
hey A@di, is this by any chance the solution for m/j 08 q9? Are you sure that's the answer because i think i recognize the question and i distinctly remember my teacher giving me a completely different explanation and mentioning that it was a different concept... should i elaborate?
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hey A@di, is this by any chance the solution for m/j 08 q9? Are you sure that's the answer because i think i recognize the question and i distinctly remember my teacher giving me a completely different explanation and mentioning that it was a different concept... should i elaborate?
Please do.
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@A@di: how do we know where to place our hand?
Cos I did the mistake of the force finger coming out of the page, but the current finger is the same, so which way do we know how to place our hand ??? ???
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ok i'm attaching a picture of the notes my teacher made me jot down at the end of the question. When 2 parallel wires carry current tin the same direction the effect of the combined magnetic field results in a force of attraction. if directions are different --> force of repulsion. 9c) says there's a current going down both wires. the attachment shows combined field causing both wires to be attracted to each other. since thick rigid wire can't move, the flexible wire ends up moving toward thick wire T1-T2.
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ok i'm attaching a picture of the notes my teacher made me jot down at the end of the question. When 2 parallel wires carry current tin the same direction the effect of the combined magnetic field results in a force of attraction. if directions are different --> force of repulsion. 9c) says there's a current going down both wires. the attachment shows combined field causing both wires to be attracted to each other. since thick rigid wire can't move, the flexible wire ends up moving toward thick wire T1-T2.
Look at the picture. As the current is travelling downwards there is a south pole induced on both.
Wouldnt that cause repulsion ?
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@ari
hope the diagram helps...
although i'm not really an expert at explaining and could be making a mistake :/ could someone check this?
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Look at the picture. As the current is travelling downwards there is a south pole induced on both.
Wouldnt that cause repulsion ?
yes, i think so too. astar can check it.
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yes, i think so too.
yikess :-\
astar can check it.
ok:]
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is this right?
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no this is
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ok i'm attaching a picture of the notes my teacher made me jot down at the end of the question. When 2 parallel wires carry current tin the same direction the effect of the combined magnetic field results in a force of attraction. if directions are different --> force of repulsion. 9c) says there's a current going down both wires. the attachment shows combined field causing both wires to be attracted to each other. since thick rigid wire can't move, the flexible wire ends up moving toward thick wire T1-T2.
You answer is right. That's exactly what my teacher taught me! 8)
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phew :)
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if u still care..how my teacher tought me is
the effect is opposite to that of magnets for example
If both wires have current going downswards ( pretens its like magnets ) so north and north they are supposed to repel..but no in this case its the oposite they attract
if wires have current in opsite diretecttion..so north and south..they suposed to attract but no in this case its the opsoite they repel
cheers good revision for me :p