Jyoti Sharma Physics

Electrostatics

Overview

Electrostatics is the branch of physics that studies electric charges at rest. It explains how charges interact when they are stationary. The fundamental property of matter responsible for this is the electric charge, which can be positive (like protons) or negative (like electrons).

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Coulombโ€™s Law is the foundation of electrostatics. It states that the force between two charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

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For example, if you comb your hair, it becomes charged and can attract small paper pieces due to electrostatic forces.

Electrostatics
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Every charged particle creates an electric field around it. This field shows how the charge will influence other charges nearby. A charged comb can pull small pieces of paper towards it because of the electric field it generates.
Electrostatics also deals with concepts like which measures the work needed to move a charge in an electric field. A practical example is a lightning strike: it happens due to the movement of charges between clouds and the ground when the potential difference becomes very large.
Finally, conductors (like metals) allow charges to move freely, while insulators (like plastic) restrict the movement of charges. This is why electrical wires are covered with insulating materials to prevent shocks.

Study Materials

Chapter 4 - Moving Charges and Magnetism

Chapter 5 - Magnetism and Matter

Chapter 6 - Electromagnetic Waves

Chapter 7 - Ray Optics and Optical Instruments

Chapter 8 - Wave Optics

Chapter 9 - Dual Nature of Radiation and Matter

Chapter 10 - Semiconductor

Chapter 11 - Nuclei

Chapter 12 -Semiconductor Electronics:Materials, Decices, and Simple Circuits

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Frequently Asked Questions

1. What is Electrostatics?

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Coulomb’s Law states that the force of attraction or repulsion between two point charges is directly proportional to the product of the magnitudes of the charges and inversely proportional to the square of the distance between them. ๐น = ๐‘˜ ๐‘ž 1 ๐‘ž 2 ๐‘Ÿ 2 F=k r 2 q 1โ€‹q 2โ€‹โ€‹Where ๐‘˜ k is the Coulomb constant.
The electric field at a point is defined as the force experienced by a unit positive charge placed at that point. Its SI unit is N/C. ๐ธ โƒ— = ๐น โƒ— ๐‘ž E = q F
Electric potential at a point is the work done in bringing a unit positive charge from infinity to that point. It is a scalar quantity, and its unit is volt (V). ๐‘‰ = ๐‘Š ๐‘ž V= q Wโ€‹
Gaussโ€™s Law states that the net electric flux through any closed surface is equal to 1 ๐œ– 0 ฯต 0โ€‹1โ€‹times the net charge enclosed within that surface. โˆฎ ๐ธ โƒ— โ‹… ๐‘‘ ๐ด โƒ— = ๐‘ž enclosed ๐œ– 0 โˆฎ E โ‹…d A = ฯต 0โ€‹q enclosedโ€‹โ€‹