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Electric Charge and Electric Field — Revision Notes

NIOS · Class 12 · Physics

Electric Charge and Electric Field revision notes for NIOS Class 12 Physics: 4 topics in quick points. Part of the NIOS Class 12 Physics syllabus.

43 questions34 flashcards17 formulas & key relations5 concepts

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An illustration showing two neutral objects (e.g., a glass rod and a silk cloth, or a comb and hair) before rubbing, during rubbing with electron transfer, and after rubbing with resulting positive an
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Key Topics to Revise

1

Electric Charge — Basic Properties

  • Electric charge is a fundamental property of matter that causes it to experience a force when placed in an electric or magnetic field.
  • There are only TWO types of charges in nature: Positive charge (on glass rod rubbed with silk) and Negative charge (on rubber rod rubbed with fur/wool).
  • Like charges REPEL each other; Unlike charges ATTRACT each other.
2

Coulomb's Law

  • Coulomb's Law (1785) gives the electrostatic force between two POINT CHARGES at rest.
  • The force is directly proportional to the product of the two charges and inversely proportional to the square of the distance between them.
  • This is an INVERSE SQUARE LAW — same as Newton's Law of Gravitation.
3

Electric Field

  • Electric field (E) at a point is the force experienced by a unit positive test charge placed at that point.
  • The test charge q₀ must be INFINITESIMALLY SMALL so that it does not disturb the original charge distribution.
  • Electric field is a VECTOR quantity — its direction is the same as the direction of force on a POSITIVE test charge.
4

Electric Dipole and Dipole Moment

  • An ELECTRIC DIPOLE consists of two equal and opposite charges (+q and -q) separated by a small distance 2l.
  • Real-life examples: water molecule (H₂O), HCl molecule — they are permanent electric dipoles.
  • DIPOLE MOMENT (p) = q × 2l (product of charge magnitude and separation between charges).

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Full Notes

Key Concepts

When two objects are rubbed togetherThe total electric charge ofElectric charge always exists in discreteCoulomb's Law gives the force betweenWhen multiple charges are present

Frequently Asked Questions

What are the important topics in Electric Charge and Electric Field for NIOS Class 12 Physics?
Key topics in Electric Charge and Electric Field include Electric Charge — Basic Properties, Coulomb's Law, Electric Field, Electric Dipole and Dipole Moment. Study these first, then practise questions on each for the NIOS Class 12 board exam.
How should I revise Electric Charge and Electric Field for the NIOS Class 12 board exam?
Learn the core ideas first, then work through the 43 practice questions on Electric Charge and Electric Field. Revise definitions regularly and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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