Electrical Charges and Fields
Kerala Board · Class 12 · Physics
Quick revision notes for Electrical Charges and Fields — Kerala Board Class 12 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Properties of Electric Charge
- Electric charge is a fundamental property of matter discovered through friction experiments
- Only two types of charges exist: positive (glass rubbed with silk) and negative (rubber rubbed with fur)
- Like charges repel, unlike charges attract - fundamental law of electrostatics
Coulomb's Law
- Coulomb's law gives force between two point charges separated by distance r
- Force is directly proportional to product of charges and inversely proportional to square of distance
- Force acts along the line joining the two charges - central force
Electric Field
- Electric field is force per unit positive test charge at any point
- Field exists around charges even without test charge present
- Direction of field is direction of force on positive test charge
Electric Dipole
- Electric dipole consists of two equal and opposite charges separated by small distance
- Dipole moment is vector from negative to positive charge with magnitude p = q×2l
- Field due to dipole varies as 1/r³ (not 1/r² like point charge)
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Electrical Charges and Fields covers several key topics that are frequently asked in Kerala Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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Sources & Official References
- Kerala Board of Public Examinations — keralapareekshabhavan.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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