IIT JAM Physics 2026 | LCR Circuit Problem Explained with Resonance Concept #IITJAM2026 #JAMPhysics

In this video, we solve and explain an important LCR Circuit problem from IIT JAM Physics 2026. LCR circuits are a fundamental topic in electromagnetic theory and alternating current (AC) circuits, and they are frequently tested in competitive examinations such as IIT JAM Physics, CSIR NET Physics, JEST, TIFR GS, and GATE Physics. An LCR circuit consists of an inductor (L), capacitor (C), and resistor (R) connected either in series or parallel. When an alternating voltage source is applied, the circuit exhibits interesting phenomena such as impedance variation, phase differences, and resonance, which are important concepts in electrical and electronic systems. In this lecture, we carefully analyze the IIT JAM problem and explain the physics behind the behavior of an LCR circuit. The discussion includes how impedance is calculated, how phase relationships arise between voltage and current, and how resonance occurs in AC circuits. For a series LCR circuit, the impedance is given by: Z = √(R² + (XL − XC)²) where XL = ωL (inductive reactance) XC = 1 / (ωC) (capacitive reactance) ω = angular frequency of the AC source The current in the circuit is: I = V / Z Resonance occurs when the inductive reactance equals the capacitive reactance: XL = XC which gives the resonant angular frequency: ω₀ = 1 / √(LC) At resonance, the impedance becomes minimum and the current reaches its maximum value. Key concepts explained in this video include: • Structure and components of an LCR circuit • Understanding inductive and capacitive reactance • Calculation of impedance in AC circuits • Concept of phase difference between voltage and current • Condition for resonance in LCR circuits • Techniques for solving IIT JAM Physics circuit problems quickly LCR circuit questions in competitive examinations often test whether students understand how reactance changes with frequency and how resonance conditions affect current and impedance. This video is part of our IIT JAM Physics 2026 Full Paper Solution Series, where we solve real exam questions and explain the concepts in a structured and exam-oriented way. The aim is to help students strengthen both conceptual understanding and problem-solving techniques. This lecture will be especially useful for students preparing for: IIT JAM Physics CSIR NET Physics JEST Physics TIFR GS Physics GATE Physics MSc Physics Entrance Examinations At Dr. Sourav Sir’s Classes, we focus on concept clarity, systematic problem solving, and detailed analysis of previous year questions so that students can perform confidently in competitive exams. For academic guidance and coaching support: Website: www.souravsirclasses.com Contact: 9836793076