Resistivity : Numericals (Example 12.5 & 12.6) || in Hindi for Class 10

n this Physics video for Class 10 in Hindi we solved some numerical problems on resistivity. This is a topic of Chapter 12 - 'Electricity' from NCERT for Class 10. Electrical resistivity is a fundamental property of a material that measures how strongly it resists electric current. Electrical resistivity of a material is defined as the resistance offered by a slab of unit length and unit cross sectional area made by that material. SI unit of resistance is ohm - meter (Ω-m) Example 12.5 Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature? Example 12.6 A wire of given material having length l and area of cross-section A has a resistance of 4 Ω. What would be the resistance of another wire of the same material having length l/2 and area of cross-section 2A? 👇👇👇👇👇👇 𝑷𝑳𝑨𝒀𝑳𝑰𝑺𝑻 👇👇👇👇👇👇 🔴 Click here to watch the whole playlist on Chapter 12 : 'Electricity' for Class 10 :    • Electric Current || in Hindi for Class 10   👇👇👇👇👇👇 𝑷𝒓𝒆𝒗𝒊𝒐𝒖𝒔 𝑽𝒊𝒅𝒆𝒐𝒔 👇👇👇👇👇👇 🔴 What is Proportionality    • Proportionality (in Hindi)   🔴 Electric Current (Introduction)    • Electric Current || in Hindi for Class 10   🔴 Electric Charge and Coulomb's Law    • Electric Charge and Coulomb's Law || in Hi...   🔴 Electric Field    • Electric Field || in Hindi for Class 10   🔴 Electric Potential    • Electric Potential and Potential Differenc...   🔴 Why is Current Constant in a Wire    • Why is Current Constant in a Wire || in Hi...   🔴 Microscopic Equation for Electric Current    • Microscopic Equation for Current || Ohm's ...   🔴 Circuit Diagram    • Circuit Diagram || in Hindi for Class 10   🔴 Ohm's Law and Resistance    • Ohm's Law and Resistance || in Hindi for C...   🔴 Resistivity and Factors of Resistance    • Resistivity and Factors of Resistance || i...