Calculation of Total Inductance of a Straight Conductor of Finite Length
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1 Cacuation of Tota Inuctance of a Staigt Conucto of Finite Lengt PRIYANKA PATEL C.U. Sa Science Coege, Asam Roa, Ameaba 384 E-mai: jgos4@yaoo.com ASTRACT Tis atice pesents cacuation of tota inuctance of a staigt conucto. Supisingy, it is not easy to fin an expession fo te inuctance of a staigt piece of conucto. In tis atice, te tota inuctance of a staigt conucto is cacuate using te iot-savat aw. Te esut is vey usefu as a buiing bock fo moe compex stuctues, an aso because te inuctance of a conucto is impotant in ig fequency o ig spee eectica cicuits. Intouction Te pionee expeiments of Faaay on te inuction of a cuent in a conucto wen te magnetic fux inke wit te conucto is cange e to two vey impotant aws in pysics. Fist is te Faaay s Law an te secon is te Lenz s Law. Faaay s aw states tat te inuce eecto motive foce (e.m.f.) in a cicuit, wen te magnetic fie aoun it is cange, is equa to te ate of vaiation of te numbe of ines of magnetic inuction inke wit te cicuit. Lenz s aw states tat te iection of te inuce cuent ue to te inuce eecto motive foce is suc as to ty to stop te action taking pace, i.e. to oppose te vaiation of te magnetic fux inke wit te cicuit. Te magnetic fux is mae to incease positivey, so te e.m.f. opposes tis cange. Tis penomenon is cae te eectomagnetic inuction. Consequences of tis penomenon of eectomagnetic inuction ae te effects of sef-inuction an mutua inuction. Te coefficient of sef-inuctance, o te sef-inuctance L, is efine as te fux inke wit te cicuit wen unit cuent fows in it. Pysics Eucation Juy Septembe 9 93
2 Eaboating fute, wen an eectic cuent I fowing oun a cicuit it pouces a magnetic fie an ence a magnetic fux Φ toug te cicuit. Te atio of te magnetic fux to te cuent is cae te inuctance, o moe accuatey sef-inuctance of te cicuit. Te tem was coine by Oive Heavisie in Febuay 886. It is customay to use te symbo L fo inuctance, possiby in onou of te pysicist Heinic Lenz. Te quantitative efinition of te inuctance is teefoe L=ΦI, wee I is te cuent in te cucuit. It foows tat te SI units fo inuctance ae webes pe ampee. In onou of Josep Heny, te unit of inuctance as been given te name eny (H): H = Wb/A. Hence wen I = Ampee, L=Φ. Cacuation of Inuctance of a Staigt Conucto Atoug te inuctances of cicuit eements not associate wit magnetic mateias ae inepenent of te vaue of te cuent an epenent ony on te geomety of te system, it is ony in te simpest cases tat tese constants can be cacuate exacty. Supisingy, it is not easy to fin an expession fo te inuctance of a staigt piece of conucto of a finite engt. An yet tis esut is vey usefu as a buiing bock fo moe compex stuctues, an aso because te inuctance of a conucto is impotant in ig fequency o ig spee eectica cicuits. If we consie te conucto in isoation we ignoe te question of ow te cuent gets to te conucto. ut tat cuent, oweve it is eivee, wi affect te fux, wic is eveope in te vicinity (outsie) of te conucto an aso insie te conucto. In tis epot we cacuate te fux eveope pe unit cuent outsie an insie te conucto sepaatey an efine it as extena an intena inuctance espectivey. Te tota sefinuctance o te inuctance of te staigt conucto is ten given by aing te extena an intena inuctances. Cacuation of Extena Inuct- (a) ance We efine te extena inuctance of te staigt conucto as te fux eveope outsie te conucto ue to unit cuent passing toug te conucto in te egion boune by ines pepenicua to te beginning an en of te conucto. We eive te fomua in te simpest possibe manne, using te aw of iot an Savat in te iffeentia fom as it gives a bette pysica view of te vaious pobems consiee. Let A in Figue is a staigt conucto of engt. Let I cuent pass toug te conucto. Fist we use te iot-savat s aw to etemine te magnetic fie at a given point P outsie te conucto ue to constant cuent I. Let be a sma engt eement of te conucto. Te magnetic fie, at point P ue to cuent I in a sma engt eement of te conucto, accoing to bio-savat s aw is given by (Figue) μ I = () 3 wee, = engt of sma eement, = istance fom point P to sma eement, μ =pemeabiity constant = Tm/A. Let us assume tat te conucto is pace aong X-axis an P is any point on Y-axis ten te iection of wi be aong Z-axis. If we epesent te iection of X, Y an Z axis by î, ĵ an ˆk espectivey. Tus te magnitue of te magnetic fie at point P is μ = [sinθ + sin θ] () 94 Pysics Eucation Juy Septembe 9
3 θ 3 P θ θ θ A I I O x Q Figue : Magnetic fie cacuation at point P outsie te conucto ue to cuent I passing toug te conucto A of engt. Equation () gives te magnetic fie at a paticua point P ue to te cuent I passing toug a conucto of engt. Now, te magnetic fux Φ in a iffeentia aea at a fixe istance fom te conucto, i.e. Φ = S =. is given by μ Φ= = [sinθ + sin θ ] S To obtain te tota fux ove a of te aea we integate te above equation ove te engt of te conucto an ten ove te istance fom te conucto to infinity. Integating ove te engt of te conucto gives μ I (sin sin ) (3) = θ + θ μ I + π = Now, we integate te above equation ove te istance fom te ege of te conucto to infinity. Let te iamete of te conucto is ten we integate te above equation fom / to to obtain te tota magnetic fux outsie te conucto. Hence te tota fux is given by: Φ = = / μ + / π / / Pysics Eucation Juy Septembe 9 95
4 Φ= = Hence, / + / (4) / / Φ= = = / μ I 4 n + + π n Fom te efinition of inuctance, we obtain te extena inuctance by putting unit cuent, i.e. I = in te above equation. Teefoe te extena inuctance of a staigt conucto of finite engt is given by Lext = n ( + x) x+ Lext = n ( + x) x+ n wee x = + ( ) (b) Cacuation of Intena Inuctance H H I P I A Figue : Magnetic fie cacuation at point P insie te conucto ue to cuent I passing toug te conucto A of engt. We know tat wen a cuent, I, passes toug a conucto, te intena enegy stoe in te conucto is equa to LI. Wee, L m m is te intena inuctance of te conucto. Tis enegy is stoe in fom of magnetic enegy, wic is given by /μ pe unit voume. Te tota enegy stoe can be obtaine by integating ove tota voume of te conucto. Equating tis enegy to ½ L m I, we can cacuate te intena inuctance of te conucto. We know tat to a goo appoximation te tota magnetic fie ue to a cuent I, at any 96 Pysics Eucation Juy Septembe 9
5 point cose to te suface of te conucto wit its engt, >>> tan its aius,, is given by, I = μ (5) π wee, μ = pemeabiity an = aius. Te magnetic fie,, at any given point P insie te cyinica conucto, at a istance fom te axis of te conucto is given by μ I π = (6) wee, te cuent I is passing toug te conucto of aius. If te tota cuent, I, passes toug te conucto, ten te cuent I can be given in tems of I as, I = I ecause I=Jπ an I =Jπ Hence Substituting Eq. (7) in Eq. (6), we ave = μ I π (7) μi = (8) 4 μ Te voume eement of te conucto of aius is given by π. Te enegy in tis voume is ( π ) μ Integating tis equation wit espect to fom zeo an (= /, Figue ), te tota enegy insie te conucto can be obtaine μi V = (9) μ 6π We know tis enegy is equa to Hence, (c) L in Lin μi LI m = V= μ 6π m = 7 μi = = = = H Tota Inuctance LI, ence Tota inuctance of te staigt conucto is te sum of intena & extena inuctance an is given by: L Tota = H n ( + x) x+ + wee = engt of te conucto, = iamete of te conucto an x ( ) Concusion = +. μ I = 4 π Pysics Eucation Juy Septembe 9 97
6 We geneay associate inuctance wit a oop o coi of conucto. Howeve, even a staigt piece of conucto, as some sef-inuctance o inuctance. Te inuctance of a staigt conucto of finite engt is cacuate stating fom te fist pincipe. It is not easy to fin an expession fo te inuctance of a staigt piece of conucto of a finite engt. Te esuts ae vey usefu an can be use as a buiing bock fo moe compex stuctues. Fute, because te inuctance of a conucto is impotant in ig fequency o ig spee eectica cicuits, te fomua eive wi be vey usefu in api cacuation of te same. Acknowegements Fist, I wou ike to tank Vikam A. Saabai Community Science Cente, Ameaba fo giving me tis oppotunity to wok at Institute fo Pasma Reseac as a pat of A..Sc. (Pysics) Pogam. I am vey muc tankfu to D. Joyeep Gos an M. oosan Paaka fo poviing pope guiance uing te couse of tis wok an aso fo eping me in many ways. I am vey muc tankfu to te Diecto, I.P.R. fo aowing me to use te institute s faciities. I am vey tankfu to D. Ragvan Rangajan (Pysica Reseac Laboatoy, Ameaba), fo giving me suc a geat oppotunity. Refeence D. J. Giffit, Intouction to Eectoynamics (3 e.), (Engewoos Ciff: Pentice Ha) 998 SUSCRIPTION RENEWAL KINDLY RENEW YOUR SUSCRIPTION SOON FOR PHYSICS EDUCATION Vo 6 (Januay Decembe 9) Use te oe fom pinte at te en of tis issue an mai it, uy compete, wit emittance to Copies of No, ae sti avaiabe, sen you oe soon. SOUTH ASIAN PULISHERS PVT LTD. 5 Siat Encave, PO Jangpua, New Dei 4-6 Pones: , , e.mai: sapub@nb.vsn.net.in; soutasian@bo.net.in 98 Pysics Eucation Juy Septembe 9
7 Pysics Eucation Juy Septembe 9 99
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