2. Drift Velocity, Relation b/w Drift Vel. & Current, Ohm's Law | JEE Main + Advanced | PYQ Solved 💯

2. Drift Velocity, Relation b/w Drift Vel. & Current, Ohm's Law | JEE Main + Advanced | PYQ Solved 💯

Next Lecture:    • 3. Resistance Calculation for 3-D Objects🔥...   Previous Lecture:    • 1. Electric Current & Current Density Mast...   Current Electricity Playlist:    • Current Electricity | JEE Advance + Main, ...   ______________________________________________ Welcome to the Current Electricity playlist! In this lecture, we take a deep dive into the heart of electron motion: We begin with the behavior of conductors in the absence & presence of electric field, leading to a powerful understanding of drift velocity — the hidden reason behind current flow in a conductor. 🔍 What You’ll Learn in this Video: ⚡What is Drift Velocity? How does it arise? ⚡Microscopic view of current in conductors ⚡Derivation of drift velocity using mean free path & thermal collisions ⚡Why drift speed is so small despite huge current ⚡Temperature dependence of resistivity explained conceptually ⚡Relation: Current vs Drift Velocity (JEE/NEET key formula) ⚡Derivation of Ohm’s Law from microscopic principles ⚡Understanding resistance, resistivity, conductivity, and mobility ⚡Microscopic form of Ohm’s Law: J = σE ⚡Graphical analysis: slope of VI graph = Resistance 🧠 Problems Solved (Includes PYQs): ⚡JEE Advanced-style drift velocity question (non-uniform cross-section) ⚡Resistance of a stretched wire – doubling the length ⚡Cutting wire into equal parts – concept of series/parallel ⚡Percentage change in resistance on stretching ⚡Most asked drift velocity formula problem ⚡JEE Main 2019 – Resistivity & Mobility problem ⚡JEE Main 2023 – Combined concept of drift velocity & resistance This lecture not only prepares you for competitive exams (JEE, NEET, Boards) but also builds strong conceptual physics from a microscopic perspective. 🎓 Perfect for: • Class 12 Physics Students • JEE Advanced / JEE Main Aspirants • NEET Aspirants • Physics Olympiad Participants 🔔 Don’t forget to: 👍 Like | 💬 Comment | 🔁 Share | 🔔 Subscribe to get more such high-quality physics videos designed for IIT JEE and NEET aspirants. 📌 Follow us for more physics related concepts 📢Telegram: t.me/physicsbydheerajsir #currentelectricity #JEEPhysics #NEETPhysics #resistors #potentialdifference #currentdensity #equivalentresistance #electriccircuits #circuittheory #kirchoffslaw #seriesparallel #driftvelocity #wheatstonebridge #JEEAdvancedQuestions #electriccurrent #IITJEE2026 #NEET2026 #JEEPreparation #Class12Physics #CBSEPhysics #jeeadvanced #physicstrick #jeemains #jeeadvanced #conductor A current of 2A exists in a wire of cross sectional area of 1mm^2. If each cubic metre of the wire contains 2*10^28 free electrons. Find drift speed. Find the velocity of charge leading to 1A current which flows in a copper conductor of cross section 1cm^2 and length 10km. Free electron density of copper is 8.5x10^28/m^3. How long will it take the electric charge to travel from one end of the conductor to the other? In a conductor, if the number of conduction electrons per unit volume is 8.5 × 1028 m –3 and mean free time is 25 fs (femto second), it's approximate resistivity is : (me = 9.1 × 10–31 kg) A current of 5 A passes through a copper conductor (resistivity = 1.7 × 10–8 Ωm) of radius of cross-section 5 mm. Find the mobility of the charges if their drift velocity is 1.1 × 10–3 m/s A uniform metallic wire carries a current 2 A. when 3.4 V battery is connected across it. The mass of uniform metallic wire is 8.92 × 10-3 kg. density is 8.92 ×103 kg/m 3 and resistivity is 1.7 × 10-8 Ω–m. The length of wire is :