Page 127 - Electrician -1st Year - TT
P. 127
TYo (Power) T«t£ 1.4.38 dLô] ùRôPo× LÚj§Vp
GXdh¬μVu (Electrician) þ LôkR®Vp Utßm ùLlTô£hPo (Magnetism
and Capacitors)
LôkR®Vp TReLs, LôkRl ùTôÚhLs Utßm LôkRj§u ÏQô§NVeLs
(Magnetic terms, magnetic material and properties of magnet)
úSôdLeLs: ClTôPj§u Ø¥®p ¿eLs ùT\ úYi¥V A±Ü §\uLs
• LôkReL°u YûLLs Utßm LôkRl ùTôÚhL°u YûLLû[ ®Y¬jRp
• LôkRj§u ©¬ÜLû[ áßRp.
LôkR®Vp Utßm LôkRm (Magnetism and ªuú]ôhP ÑÚ°p (solenoid) ªuú]ôhPm
magnets) : LôkR®Vp GuTÕ LôkRm Utßm CÚdÏm YûW UhÓm úR²Úm× ÕiPô]Õ
LôkRl ùTôÚhLû[l Tt±l T¥lTRôÏm. LôkRUôL CÚdÏm. CÕ RtLôXõL LôkRUôÏm.
LôkRj RuûU GuTÕ JÚ YûL ®ûN LôkRl×Xj§p HtTÓm ªuú]ôhPjûR
ùLôiP TϧVôÏm. CkR ®ûNVô]Õ £X ¨ßj§®hPôp úR²Úm×j ÕiÓ LôkRj
ùTôÚhL°u ÁÕ ùNVpTÓm £X RuûUûV CZd¡u\Õ.
ùTôÚhLs ÁÕ ùNVpTPôÕ. CVtûL«p úYß JÚ LôkRj§u YXõûUVô]
CkR ®ûNûV ùTt±ÚdÏm ùTôÚhLÞdÏ LôkRl×Xj§]ôp úR²Úm× ÕiPô]Õ
LôkRm Guß ùTVo. LôkRUô]Õ CÚm× AkR LôkRl×Xj§p CÚdÏm YûW AÕ
Utßm G@Ï ùTôÚhLû[ LYÚm RuûU LôkRUôL CÚdÏm.
ùLôiPÕ. úUÛm LôkRjûR ùRôeL ®Óm ¨ûXVô] LôkReLs (Permanent magnets):
úTôÕ YP ùRu ÕÚYeLû[ Lôh¥ ¨tÏm.
AúR LôkRl×Xj§p úR²Úm×dÏl T§XôL
LôkReL°u YûLLs (Classification of G@Ï ÕiûP ûYjRôp Øu× á±V T¥
magnets) : LôkReLs CWiÓ C]eL[ôL G@Ï Gg£V LôkRj§u (residual magnetism)
©¬dLlTÓ¡u\]. LôWQUôL LôkRl×Xj§p CÚkÕ GÓjR
– CVtûLd LôkReLs ©u×m LôkRjRuûU CZdLôR §\u
– ùNVtûL LôkReLs ùLôiÓs[Õ. G]úY ¨ûX LôkReLû[
TX èt\ôiÓLÞdÏ ØuúT CÚm×d EÚYôdL G@Ï ªLÜm Ht\RôÏm. CkR úRd¡
LXûY Gu\ CVtûL LôkRm ûYjR §\ú] ¬hPu¥®h¥ (retentivity)
LiÓ©¥dLlThÓ®hPÕ. CûR "úXôh G]lTÓ¡\Õ. LôkR Nd§ûV A§Lm úRd¡
vúPôu" G] AûZdLlThPÕ. (Fig 1) ûYdÏm §\u LôWQUôL G@Ï, ¨dLp,
Ap¨dúLô, PevPu úTôu\ûY ¨ûXd
LôkReLû[ EÚYôdLl TVuTÓjRl
TÓ¡u\].
LôkRlùTôÚhL°u YûLLs (Classification
of magnetic substances) : LôkRl ùTôÚhLû[
©uYÚUôß êuß ©¬ÜL[ôLl ©¬dLXôm.
@lúWô LôkRl ùTôÚhLs (Ferromagnetic
substances): LôkRjRôp YÛYôL DodLlTÓm
EúXôLeLs @lúWô LôkR EúXôLeLs BÏm.
CWiÓ YûLVô] ùNVtûL LôkReLs (E.m) CÚm×, ¨dLp, úLôTôph, G@Ï Utßm
Es[]. AûY RtLôXõL LôkRm Utßm ARu LXûYLs.
¨ûXVô] LôkReLs BÏm. TôWô LôkRl ùTôÚhLs (Paramagnetic
RtLôXõL LôkReLs ApXÕ ªu substances): Ïû\kR A[Ü LôkRjRôp
LôkReLs (Temporary magnets or electro DodLlTÓm EúXôLjûR TôWô LôkR
magnets) : JÚ £±V úR²Úm×j ÕiûP EúXôLeLs Gu¡ú\ôm. ARu
NôXõ]ônÓ AûUl©p Es[ YXõûUVô] Dol×jRuûUûV YXõûU YônkR LôkRjRôp
LôkRl×Xj§p ûYjRôp LôkRj çiPp G°§p A±V Ø¥¡\Õ. ÑÚdLUôL TôWô
LôWQUôL AÕ LôkRm B¡u\Õ. LôkR EúXôLeLs, @lúWô LôkR
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