Class 12th Physics-Electric Charges and Fields- Fundamental Concepts of electric Charge -part-2<\/p>\n
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Sure! Here’s a Class 12 Physics<\/strong> explanation of the chapter “Electric Charges and Fields”<\/strong>, focusing on:<\/p>\n \ud83d\udcda Class:<\/strong> 12th CBSE\/NCERT<\/p>\n Electric charge is a basic property of matter<\/strong>.<\/p>\n<\/li>\n It can be positive<\/strong> (like proton) or negative<\/strong> (like electron).<\/p>\n<\/li>\n Like charges repel<\/strong>, unlike charges attract<\/strong>.<\/p>\n<\/li>\n Charge is quantized<\/strong> and conserved<\/strong>.<\/p>\n<\/li>\n<\/ul>\n Charge exists in discrete packets<\/strong>, not continuous.<\/p>\n<\/li>\n Smallest unit of charge = charge of an electron<\/strong> \ud83e\udde0 Formula:<\/strong> nn<\/span>n<\/span><\/span><\/span><\/span> = any integer (1, 2, 3, \u2026)<\/p>\n<\/li>\n ee<\/span>e<\/span><\/span><\/span><\/span> = elementary charge<\/p>\n<\/li>\n<\/ul>\n \ud83d\udccc Example:<\/strong> Charge can neither be created nor destroyed<\/strong>, only transferred.<\/p>\n<\/li>\n Total charge before and after any physical process remains constant<\/strong>.<\/p>\n<\/li>\n<\/ul>\n \ud83d\udccc Example:<\/strong> Glass loses electrons \u2192 becomes positively charged<\/p>\n<\/li>\n Silk gains electrons \u2192 becomes negatively charged<\/p>\n<\/li>\n Net charge = 0 (balanced)<\/p>\n<\/li>\n<\/ul>\n Charges are scalars<\/strong> (they add algebraically).<\/p>\n<\/li>\n Total charge = Sum of individual charges<\/p>\n<\/li>\n<\/ul>\n \ud83d\udccc Example:<\/strong> Friction:<\/strong><\/p>\n By rubbing two objects (e.g., balloon on hair)<\/p>\n<\/li>\n Transfers electrons<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Conduction (Contact):<\/strong><\/p>\n Charged object touches a neutral object<\/p>\n<\/li>\n Charge gets shared<\/p>\n<\/li>\n<\/ul>\n<\/li>\n Induction:<\/strong><\/p>\n No contact needed<\/p>\n<\/li>\n A charged object brought near induces opposite charge in a conductor<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n Electrostatic dust precipitators<\/strong> use electric charge to clean factory smoke.<\/p>\n<\/li>\n Photocopiers<\/strong> and laser printers<\/strong> work using charge principles.<\/p>\n<\/li>\n<\/ul>\n
\n\ud83d\udcd8 Chapter: Electric Charges and Fields<\/strong><\/h2>\n
\u2728 Topic: Fundamental Concepts of Electric Charge \u2013 Part 2<\/strong><\/h3>\n
\n\ud83d\udd01 Quick Recap from Part 1:<\/strong><\/h3>\n
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\n\ud83d\udd2c Part 2: Fundamental Concepts Continued<\/strong><\/h2>\n
\n\u269b\ufe0f 1. Quantization of Charge<\/strong><\/h3>\n
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e=1.6\u00d710\u221219\u2009Coulombse = 1.6 \\times 10^{-19} \\, \\text{Coulombs}<\/span>e<\/span>=<\/span><\/span>1.6<\/span>\u00d7<\/span><\/span>1<\/span>0\u221219<\/span><\/span><\/span><\/span><\/span><\/span><\/span>Coulombs<\/span><\/span><\/span><\/span><\/span><\/p>\n<\/li>\n<\/ul>\n
Any charge q=\u00b1n\u22c5eq = \\pm n \\cdot e<\/span>q<\/span>=<\/span><\/span>\u00b1<\/span>n<\/span>\u22c5<\/span><\/span>e<\/span><\/span><\/span><\/span>
Where:<\/p>\n\n
If a body has charge q=3.2\u00d710\u221219\u2009Cq = 3.2 \\times 10^{-19} \\, C<\/span>q<\/span>=<\/span><\/span>3.2<\/span>\u00d7<\/span><\/span>1<\/span>0\u221219<\/span><\/span><\/span><\/span><\/span><\/span><\/span>C<\/span><\/span><\/span><\/span>, then:
n=q\/e=2n = q\/e = 2<\/span>n<\/span>=<\/span><\/span>q<\/span>\/<\/span>e<\/span>=<\/span><\/span>2<\/span><\/span><\/span><\/span> \u2192 It has 2 extra electrons<\/strong><\/p>\n
\n\ud83d\udd01 2. Conservation of Charge<\/strong><\/h3>\n
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In rubbing a glass rod with silk:<\/p>\n\n
\n\u26a1 3. Additivity of Charge<\/strong><\/h3>\n
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If a body has +3 C and -2 C on different parts,
Net charge = 3C\u22122C=+1C3C – 2C = +1C<\/span>3<\/span>C<\/span>\u2212<\/span><\/span>2<\/span>C<\/span>=<\/span><\/span>+<\/span>1<\/span>C<\/span><\/span><\/span><\/span><\/p>\n
\n\ud83e\uddf2 4. Methods of Charging<\/strong><\/h3>\n
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\n\ud83e\udde0 Real-Life Application:<\/h3>\n
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\n\u270d\ufe0f Summary (Key Points):<\/h2>\n