Muft Shiksha™ एक 100% Free Education Portal है 🇮🇳, जिसका उद्देश्य Class 9–12 के हर विद्यार्थी तक High-Quality Education को पूरी तरह मुफ्त पहुँचाना है। 🇮🇳 हम मानते हैं कि अच्छी शिक्षा किसी student की आर्थिक स्थिति पर निर्भर नहीं होनी चाहिए। 🇮🇳 हर विद्यार्थी को वही Quality Study Material, MCQs, Quizzes, Exam Preparation, Concept-Based Learning और Bilingual Support मिलना चाहिए, जो आमतौर पर महंगी Coaching या Premium Platforms में मिलता है। Muft Shiksha™ 🇮🇳 इसी सोच के साथ बनाया गया है
SubjectsPhysics
गाउस का नियम और इसके अनुप्रयोग
In this Class 12 Physics topic from Chapter 1, Electric Charges and Fields, students learn how electric flux is related to the net charge enclosed by a closed surface through Gauss’s law. The topic develops the idea of Gaussian surfaces, uses symmetry to simplify electric-field calculations, and applies the law to charged spherical shells, uniformly charged spheres, infinite line charges, and plane sheets. It also helps students understand the electric field inside conductors and choose suitable surfaces for solving electrostatic problems.
TOPIC PRACTICE
Up to 11 questions from this page. Select your focus, then start.
Step 1: Cylindrical symmetry has a long axis. Step 2: An infinitely long uniformly charged line has this symmetry around it. Step 3: Choose a cylindrical Gaussian surface for such cases.
Step 1: Plane symmetry means the surface is very large and uniformly spread. Step 2: An infinite uniformly charged sheet is the ideal example. Step 3: A pillbox Gaussian surface is useful here.
Step 1: A spherical shell has spherical symmetry. Step 2: A Gaussian sphere outside encloses the whole charge. Step 3: Hence the outside field behaves like that of a point charge at the centre.
Step 1: Charge of a spherical shell lies on its surface. Step 2: A Gaussian surface inside the shell encloses no charge. Step 3: Therefore the enclosed charge is zero.
Step 1: In electrostatic equilibrium, field inside the conducting material is zero. Step 2: If there is no charge in the cavity, there is no source inside it. Step 3: Hence field in the cavity is zero.
Step 1: Field lines leaving the surface give positive outward flux. Step 2: If more lines leave than enter, total flux is positive. Step 3: Therefore net enclosed charge is positive.
Step 1: Lines entering the surface give negative contribution to outward flux. Step 2: If entering lines are more, total flux is negative. Step 3: Therefore net enclosed charge is negative.
Step 1: Entering lines give negative flux. Step 2: Leaving lines give positive flux. Step 3: If both are equal, total flux and enclosed charge are zero.
Step 1: Gauss's law is a general law. Step 2: Its direct use is easiest when good symmetry exists. Step 3: In school-level problems, identifying symmetry is the first step.
Step 1: Field near a conductor surface is related to surface charge density. Step 2: Larger surface charge density indicates stronger field. Step 3: Remember the direct relation between surface charge and field.
Step 1: Symmetry is very important in Gauss's law calculations. Step 2: Point or sphere gives spherical, line gives cylindrical, and sheet gives plane symmetry. Step 3: Identify the symmetry type quickly while reading the question.
QUIZ COMPLETE
