Magnetic Susceptibility Trick: Field Change in Solenoid ⚡
❓ Concept 🎬 Solenoid + Magnetic Material = New Magnetic Field | Concept in 59 Sec Solenoid ke andar vacuum/air ki jagah agar magnesium ya koi magnetic material bhar diya… 👉 Magnetic field badal jaati hai 🧲 Par kyun , aur kitni ? Yeh concept JEE mein baar-baar aata hai 🔥 🖼️ Concept Image ✍️ Short Explanation Is type ke questions mein calculation kam aur definition zyada important hoti hai. Agar tum μ, μr aur χ ka relation pakad loge, toh answer seconds mein nikal jaata hai 😎 🎯 HOOK (Write & Read First) “Agar solenoid ke andar vacuum ki jagah magnesium bhar diya… toh magnetic field badh jaati hai — par kyun aur kitni?” 🧲🤔 🔹 Step 1 — Magnetic Field of a Solenoid (in Air / Vacuum)** Long solenoid ke liye: B 0 = μ 0 n I Yahaan: n n = turns per unit length I I = current μ 0 \mu_0 = permeability of free space 📌 Yeh reference field hota hai (without material). 🔹 Step 2 — When a Magnetic Material is Inserted Material daaln...