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Electricity

Blazing goIITian

 Joined: 19 Mar 2012 Post: 421
25 Mar 2012 10:46:07 IST
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Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Electricity

12 WIRES , EACH OF RESISTANCE r ARE JOINED TOGETHER TO FORM A CUBE. FIND THE EQUIVALENT RESISTANCE IN THE EDGE OF CUBE . I DID IT USING KIRCHOFF LAW N FOUND IT TO BE VERY LONG.PLEASE GIVE ME A SHORTCUT TO SOLVE IT. I WILL BE REALLY THANKFUL!

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Hot goIITian

Joined: 14 Feb 2012
Posts: 191
25 Mar 2012 11:17:52 IST
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7r/12 is the equvivalent resistance....

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 13:42:11 IST
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IT IS CORRECT BUT PLEASE MENTION THE STEPS ALSO.

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 19:34:42 IST
4 people liked this

7r/12 is the answerdo it using symmetry it is very easy...just take symetry about the edge about which you want tofind answer consider the edge to be AB i.e current is entering into circuit at A and going out at B then the points at which the current is directly coming from A at same point and point from which current is directly coming to B are at same point redraw the diagram and now solve it wud be easily solved.....

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 20:00:35 IST
0 people liked this

CAN YOU PROVIDE ME THE WHOLE SOLUTION PLEASE......I AM TRYING IT AGAIN & AGAIN ONLY TO GET A WRONG ANSWER..I THINK I AM MISSING OUT SOMETHING.

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 20:06:47 IST
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take a cube let about the edge AB you wana find resistence ok...now consider that a batry is conected to AB with positive terminal attatched to A and negative to B now see the points corners at which current is directly going from EXCLUDING B there will be 2 such points similarly 2 such points will be there from which B is directly geting current consider the 2 points for A at same position and FOR B at another position and reconect resistences

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 20:08:04 IST
4 people liked this

if u still dont gt it then tell me the steps u r following i will tellu where u r wrong.....

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 20:11:39 IST
2 people liked this

and let me tell u that dont loose heart if u dont gt to understand symmetry i also took a month to learn to apply it.u cn also take help of ur teachers...

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 21:20:24 IST
1 people liked this

yes, i got 2 point corners from where current directly goes.WHAT TO DO AFTER THAT?BTW THANKS! YOU HAVE BEEN REALLY VERY HELPFUL...

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 21:30:48 IST
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take those corners at one point now similarly find 2 such points for B take them at one point and then re drew the circuit by puting resistences b/w the points as earlier and the circuit will gt simpler and easy to solve..and ya ek student hi student ke dard ko smajh skta hai......he he so no thank u(s)......if u still dont gt it then tell me the steps u followed i will point out the error.....

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 22:19:22 IST
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Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 22:20:36 IST
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OOPS! SORRY THE FULL IMAGE DID NOT COME.

Scorching goIITian

Joined: 18 Feb 2012
Posts: 264
25 Mar 2012 22:24:16 IST
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see this kareena physweb.bgu.ac.il/COURSES/PHYSICS.../e_42_1_024_s_TeX.pdf

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 22:36:52 IST
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@ pooja- just click on the image n it would maximize.

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 23:01:15 IST
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NOW IN YOUR FIGURE, the points in which current equal to i is going are at same point let it be Q and the points from which current i is coming to B are at same point let it be W THE YOU WILL GET two resistences b/w A nd Q two B/W B nd W AND CONECT REST OF THEM AS BEFORE

Blazing goIITian

Joined: 23 Dec 2011
Posts: 1180
25 Mar 2012 23:04:05 IST
1 people liked this

IF U STIL DONT GT IT THEN TELL ME I WILL WORK ON SOME OTHER MEANS TO CONVEY YOU THE SOLUTION IF U R ON FACEBUK I WILL POST THE PIC OF SOLUTION TO U.....

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 23:51:25 IST
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I AM STILL NOT GETTING IT. YOU CAN POST THE PIC OF THE SOLUTION IN GOIIT.COM ONLY.JUST CLICK ON THE ANSWER BUTTON BELOW MY QUESTION POST . THEN CLICK ON IMAGE BUTTON.

Blazing goIITian

Joined: 19 Mar 2012
Posts: 421
25 Mar 2012 23:53:55 IST
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YOU CAN ALSO USE PAINT AS I DID TO POST MY SOLUTION.

Cool goIITian

Joined: 21 Mar 2012
Posts: 48
26 Mar 2012 00:26:29 IST
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hey,in ur image u took i same in all three branches coming out of A...how??ther isnt any symmetry to consider so..(only two of them should have same i and other should be diff)

Blazing goIITian

Joined: 8 Sep 2011
Posts: 437
26 Mar 2012 00:33:00 IST
1 people liked this

do you have ncert class 12 phy? its a solved example in the chapter current electricity...

if you dont then heres the link http://ncert.nic.in/NCERTS/textbook/textbook.htm?leph1=3-8

its on page 116

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