1. Electric Current & Current Density Masterclass 💡 | JEE Main + Advanced | NEET | Don't Miss This⚠️

Next Lecture: https://youtu.be/_3EwsSXQ6ns
Current Electricity Playlist: https://www.youtube.com/playlist?list=PLOT1B9apf5QuLO2LwfF6e3MkW5flrgniG
Electrostatic-2 Playlist: https://www.youtube.com/playlist?list=PLOT1B9apf5QtACWs1BN6pIePkUdlMlegt
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Welcome to the first episode of the Current Electricity Series!
This lecture sets the foundation for one of the most scoring yet misunderstood topics in JEE Physics – Electric Current and Current Density. Whether you're preparing for JEE Main, JEE Advanced, or Olympiads, this video will take your understanding to the next level.

🚀 Topics Covered:

🔋 Electric Current:
• Instantaneous Current, Average Current, Charge Flown
• Units in SI and CGS
• Scalar nature of Current
• Graphical Understanding: Area under i–t graph
• Direction convention
• One Ampere definition

🧠 Problems Solved:
📌 i = 4t² + 6t + 4 — Find charge flown in 5s
📌 JEE Main 2024 problem: I = I₀ + βt, find charge in 20s
📌 q = t² + 4t + 5, find Instantaneous current at t = 3s and Average current from t = 0 to 2s

🧲 Current Density (J):
• Vector quantity
• Relation: J = I/A
• Uniform and Non-uniform Current Density
• Integral form: dI = J·dA

🧪 Advanced Applications:
• Current through a wire of radius R with non-uniform J = J₀(1 – r/R)
• Conceptual clarity: Why electric field is not zero inside a current-carrying conductor
• Battery's Role in maintaining current — intuitive & practical explanation
• JEE Main 2022 problem related to current density discussed in depth!

🎓 Perfect for:
• Class 12 Physics Students
• JEE Advanced / JEE Main Aspirants
• NEET Aspirants
• Physics Olympiad Participants

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The current density in a cylindrical wire of radius 4 mm is 4 x 10^6 Am^-2 . The current through the outer portion of the wire between radial distance R/2 and R is ___ πA.

The electric current through a wire varies with time as I = Io + βt where Io = 20 A and β = 3 A/s. The amount of electric charge crossed through a section of the wire in 20 s is :

Видео 1. Electric Current & Current Density Masterclass 💡 | JEE Main + Advanced | NEET | Don't Miss This⚠️ канала Dheeraj Sir IIT-D