Seedha Taar Mod Do 🔄
Seedhe taar ka field ek gol chakra tha — par bahut kamzor aur bikhra hua. Ab ek chhota sa jugaad karte hain: taar ko ek gol loop mein mod dete hain.
📌 Loop mein kya badalta hai:
Loop ke har hisse ka field, loop ke beech mein
ek hi disha mein banta hai. Isliye sab
jud kar ek taakatwar field ban jaata hai.
Beech mein lines lagbhag seedhi ho jaati hain — aur ek loop ek
chhote magnet jaisa vyavhaar karne lagta hai: ek taraf
N, doosri taraf S.
🎯 Loop ka field kis par nirbhar karta hai:
🔹 Current zyada → field zyada
🔹 Loop chhota → field zyada (beech mein)
🔹 Pheeron ki ginti (turns) zyada → field zyada
Agar ek hi loop ki jagah n pheere lagaao, toh field lagbhag
n guna ho jaata hai — kyunki har pheera apna field usi disha mein jodta hai.
🌀 Solenoid — Bahut Saare Loop Ek Saath
Ab ek lambi naali (jaise pen ya keel) par taar ke bahut saare pheere lapet do. Isi ko solenoid kehte hain.
📌 Solenoid ki teen khaas baatein:
1️⃣ Uske andar ka field seedha, ek jaisa (uniform) aur
taakatwar hota hai
2️⃣ Bahar ka field bilkul bar magnet jaisa dikhta hai
3️⃣ Ek sira N aur doosra S ban jaata hai
N kaunsa sira hoga? Iske liye phir wahi
right-hand rule: seedhe haath ki ungliyan
current ke bahne ki disha mein mod kar solenoid ko pakdo — aapka
angootha jis taraf hoga, wahi N pole (dhruv) hai.
Bar magnet ka field bikhra hua hota hai — jagah-jagah alag. Par solenoid ke
andar ka field har jagah bilkul ek jaisa hota hai.
Aur sabse badi baat: use aap chalu-band kar sakte ho, aur uski
taakat badal sakte ho — bas current badal do!
Isiliye har wo cheez jise controlled magnetic field chahiye, solenoid par hi
chalti hai — MRI machine, particle accelerator, aur har
electric bell aur relay.
🔩 Electromagnet — Marzi Se Chalne Wala Magnet
Ab ek aur chhota sa jugaad: solenoid ke andar ek loha (soft iron) ki keel daal do. Aur ho gaya electromagnet — ek magnet jise aap switch se chalu-band kar sakte ho.
📌 Loha kyun daalte hain? Kyunki soft iron khud
magnet ban jaata hai aur field ko
sainkdon guna tak badha deta hai.
Aur "soft" iron hi kyun? Kyunki wo current band hote hi apna magnetism
turant chhod deta hai. Steel ka istemaal karo toh wo
hamesha ke liye magnet ban jaayega, aur band karne par bhi chipka rahega — jo
electromagnet ke liye bekaar hai.
| Permanent magnet | Electromagnet | |
|---|---|---|
| Kis se banta | Steel | Soft iron + coil + current |
| Chalu-band | Nahi ho sakta | Ho sakta hai |
| Taakat | Fix | Badal sakte hain |
| Poles palat sakte? | Nahi | Haan — current ulta karo |
| Kitna taakatwar | Seemit | Bahut zyada ho sakta hai |
💪 Electromagnet taakatwar kaise banayein — teen tareeke:
1️⃣ Pheere (turns) badhaao — jitne zyada pheere, utna taakatwar
2️⃣ Current badhaao
3️⃣ Andar soft iron ka core daalo (sabse bada farak yahi karta hai)
Darwaze ki ghanti (electric bell) poori tarah electromagnet par chalti hai:
1️⃣ Aap switch dabate ho → circuit poora → electromagnet chalu
2️⃣ Electromagnet lohe ki patti (armature) ko kheench leta hai
3️⃣ Patti ke saath juda hathoda ghanti par maarta hai — tan!
4️⃣ Par patti khisakne se circuit toot jaata hai → electromagnet
band
5️⃣ Patti wapas apni jagah → circuit phir poora → phir chalu...
Ye chakra ek second mein kai baar chalta hai — isiliye ghanti
"tan-tan-tan" lagataar bajti hai jab tak aap button dabaye rakhte ho!
Aapne kabaad (scrap) ke maidan mein crane ke neeche latka bada gol magnet dekha hoga, jo poori
gaadi utha leta hai.
Wo permanent magnet nahi ho sakta — kyunki phir gaadi ko
chhodne ka koi tareeka hi nahi hota! Wo ek bahut bada
electromagnet hai. Current chalu = gaadi chipak gayi. Current band = gaadi gir
gayi.
Yahi soch MRI machine mein bhi hai (bahut taakatwar solenoid), aur
maglev train mein — jo patri ko chhue bina, magnetic field par
tairti hui chalti hai.
Bharat ke har gaon mein aaj bijli ka jo MCB lagta hai, uske andar ek chhota
electromagnet hi baitha hota hai. Jab current zyada ho jaata hai, toh us
electromagnet ka field itna badh jaata hai ki wo ek chhoti si patti ko
kheench kar switch gira deta hai — aur poori line kat jaati hai.
Isi tarah gaon ke submersible pump ka starter, mixer, pankha, cooler — sab ke
andar coil aur electromagnet hi kaam kar raha hota hai.
Aur bade paimane par: bharat ki bijli ki poori vitaran vyavastha (transformers,
relays, circuit breakers) isi ek siddhaant par khadi hai —
current se magnet, aur magnet se control.
🧠 Apne Aap Ko Test Karo
🔩 Electromagnet Explorer mein pheere aur current badal kar dekho kitni pinein uthengi!
Open Electromagnet Explorer →