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Welcome to eGyanKosh, your comprehensive resource for academic materials and study guides. In this section, we present an essential study material focused on “प्रयोग-4 ली एवं चार्ल्टन की चकती विधि द्वारा कुचालक पदार्थ का ऊष्मा चालकता गुणांक ज्ञात करना” (Experiment-4: Determining the Thermal Conductivity Coefficient of Insulating Materials Using Lee and Charlton’s Method). Designed specifically for IGNOU students preparing for the 2025 examinations, this resource offers detailed explanations, step-by-step procedures, and valuable insights into the principles of thermal conductivity. Download the study material for free and enhance your understanding of this fundamental topic in physics!