Wo Ek Pal Jisne Duniya Badal Di ⚡
Hans Christian Oersted Denmark mein ek professor the. Ek din class mein wo bijli
par prayog dikha rahe the. Table par ek compass bhi rakha tha — bina kisi khaas
wajah ke.
Jaise hi unhone taar mein current chalu kiya, compass ki sui
achanak hil gayi.
Us zamaane tak duniya maanti thi ki bijli aur magnet do bilkul alag cheezein hain —
jinka koi rishta nahi. Oersted ne dekha ki
bijli se magnetic field banta hai.
Unhone current band kiya — sui wapas apni jagah. Phir chalu — sui phir hil gayi.
Current ULTA kiya — sui doosri taraf hil gayi!
Ye ek chhoti si ghatna thi. Par isi se poori
electromagnetism ki shuruaat hui — aur aaj har motor, pankha, mixer, lift, train,
speaker aur bijli-ghar isi ek khoj par khada hai.
📌 Oersted ka nateeja: jab kisi taar mein current bahta hai, toh uske
aas-paas magnetic field ban jaata hai.
Aur wo field:
🔹 Taar ke chaaron taraf gol chakron mein hota hai
🔹 Taar ke paas taakatwar, door jaate hi kamzor
🔹 Current badhaao toh field badhta hai
🔹 Current ulta karo toh field bhi ulta ho jaata hai
👍 Right-Hand Thumb Rule
Field ki disha kaise pata karein? Iske liye ek bahut aasaan tareeka hai — aur iske liye bas aapka seedha (right) haath chahiye.
📌 Right-hand thumb rule:
Apne seedhe haath se taar ko is tarah pakdo ki
angootha (thumb) CURRENT ki disha mein ho.
Ab aapki baaki ungliyan jis taraf mudengi — wahi
magnetic field ki disha hai.
⚠️ Seedha haath hi — ulta haath lagaya toh jawab bilkul ulta aayega!
🎯 Do chinh yaad rakho (ye exam mein bahut aate hain):
🔵 Bindu (dot) ⊙ = current aapki taraf, page se
BAAHAR
Soch: teer aapki taraf aa raha hai, toh aapko uski
nok dikhegi
❌ Cross (×) ⊗ = current page ke ANDAR
Soch: teer door ja raha hai, toh aapko uske
par (feathers) dikhenge
Ek taar seedha khada hai aur usme current upar ki taraf bah raha
hai. Aap taar ke saamne khade ho. Taar ke daayen taraf field kis
disha mein hoga?
Hal: seedha haath uthao, angootha upar karo (current ki disha).
Ab ungliyan mod kar dekho — daayen taraf wo page ke andar ja rahi hain.
✅ Jawab: daayen taraf field page ke ANDAR (×) hai.
Aur baayen taraf? Wahan wo baahar (⊙) hoga.
📏 Field Kitna Taakatwar Hoga?
📌 Seedhe taar ke aas-paas field teen baaton par nirbhar karta hai:
1️⃣ Current (I) — current jitna zyada, field utna
taakatwar
2️⃣ Doori (r) — taar se jitna door, field utna
kamzor
3️⃣ Taar ke bilkul paas field sabse zyada hota hai
Isiliye field lines ke chakre taar ke paas ghane aur door jaate-jaate
door-door ho jaate hain — bilkul jaisa upar diagram mein dikha hai.
Aapke phone ya TV ke speaker mein ek chhota sa coil hota hai jo ek permanent magnet
ke beech rakha hota hai.
Jab music ka badalta hua current us coil mein jaata hai, toh coil ka apna
magnetic field bhi badalta rehta hai — kabhi magnet ko
dhakelta hai, kabhi kheenchta hai. Isse coil
aage-peeche kaampta hai, aur usse juda hua paper cone hawa ko kampaata hai —
aur wahi awaaz banti hai.
Yani aapke kaan tak pahunchne wala har gaana Oersted ki us hilti hui sui ka hi
seedha nateeja hai.
Bharat mein bijli ke bade taaron ke neeche khade hone par kabhi-kabhi
bhinbhinaahat sunai deti hai, aur tube light ko haath mein pakdo toh wo
halki si jal bhi sakti hai! Ye isi chapter ka asar hai — un taaron mein bahne wale
bade current se aas-paas ek achha-khaasa
badalta hua magnetic field banta rehta hai.
Isiliye niyam hai ki high-tension line ke neeche
ghar nahi banaye ja sakte, aur unke aas-paas ek khaali "right of way" chhoda jaata
hai.
Aur isi wajah se compass se raasta dhoondte waqt bijli ke khambe ya taaron se
door hatna padta hai — warna sui galat disha dikhaayegi. Yahi Oersted ne 200 saal
pehle dekha tha.
🧠 Apne Aap Ko Test Karo
🧊 3D lab mein current ulta karo aur saari field lines ko palat'te dekho!
Open 3D Magnetic Field Lab →