1. Electric Charges and Fields
рдЗрд╕ рдкреЗрдЬ рдкрд░ рдЖрдкрдХреЛ 1. Electric Charges and Fields рдХреЗ рд╕рднреА рдорд╣рддреНрд╡рдкреВрд░реНрдг рдмрд╣реБрд╡рд┐рдХрд▓реНрдкреАрдп рдкреНрд░рд╢реНрди (MCQ), рдкрд░реАрдХреНрд╖рд╛ рдЙрдкрдпреЛрдЧреА рдиреЛрдЯреНрд╕ рдФрд░ рдСрдирд▓рд╛рдЗрди рдХреНрд╡рд┐рдЬрд╝ рдорд┐рд▓реЗрдВрдЧреЗред рдЕрдкрдиреЗ рдЬреНрдЮрд╛рди рдХрд╛ рдкрд░реАрдХреНрд╖рдг рдХрд░рдиреЗ рдФрд░ рдмреЛрд░реНрдб/рдкреНрд░рддрд┐рдпреЛрдЧреА рдкрд░реАрдХреНрд╖рд╛ рдореЗрдВ рд╢рдд-рдкреНрд░рддрд┐рд╢рдд рдЕрдВрдХ рдкреНрд░рд╛рдкреНрдд рдХрд░рдиреЗ рдХреЗ рд▓рд┐рдП рдиреАрдЪреЗ рджрд┐рдП рдЧрдП рдореЙрдХ рдЯреЗрд╕реНрдЯ рдореЗрдВ рдЕрд╡рд╢реНрдп рднрд╛рдЧ рд▓реЗрдВред
ЁЯСЙ рдЕрдзреНрдпрд╛рдп рдХрд╛ рд╕рд╛рд░рд╛рдВрд╢ (Summary)
Dear students, in this chapter, we will study 1 of the most fascinating and fundamental branches of physics that forms the absolute basis of all modern technology: 'Electric Charges and Fields'. Physics is not just about complex mathematical derivations; it is the 100 percent true scientific explanation of the universe functioning around us. In this specific chapter, we will deeply dive into the invisible but extremely powerful world of stationary electric charges, which is scientifically known as Electrostatics. Every single material object in this universe is made up of atoms, and inside these atoms lie tiny protons and electrons, which carry these fundamental electrical charges.
Instead of just cramming science in closed books, if we logically connect it with our real life and daily surroundings, it becomes highly interesting. Have you ever thought deeply about why 1 plastic comb rubbed on your dry hair miraculously starts attracting tiny pieces of paper? Or why do we often see massive, terrifying flashes of lightning in the dark sky during heavy rain and thunderstorms? This is no magic trick, but it is 100 percent the scientific marvel of static electricity. When 2 suitable materials are rubbed together, electrons are actively transferred from 1 object to another, creating a net electric charge. This exact principle of electric charge and its surrounding field is responsible for the working of almost all modern electronic devices, from large televisions to your highly sensitive smartphone touchscreens.
From the strict perspective of the upcoming NCERT and RBSE board exams, this specific chapter of physics is highly scoring and extremely important for your 100 percent success. In the board exams, not only direct theoretical questions are asked from this chapter, but excellent analytical, numerical, and derivation-based questions on Coulomb's Law, Electric Dipole, and Gauss's Law definitely appear in the final exam paper every single year without fail. In this highly exciting journey, we will 1st study the basic properties of electric charges very closely, such as the quantization and conservation of charge. We will scientifically learn that charge is always quantized in exact integer multiples of the fundamental elementary charge.
Moving 1 little further in the chapter, we will logically analyze Coulomb's Law, which mathematically calculates the exact force of attraction or repulsion between 2 stationary point charges. We will deeply understand the highly important concept of the 'Electric Field', which is the invisible region around 1 charged particle where its electrical force can be effectively felt by another charge. After this, we will study Electric Flux and the extremely powerful Gauss's Law. Gauss's Law provides 1 highly simplified and brilliant mathematical tool to easily calculate the electric field produced by complex continuous charge distributions, like 1 infinitely long straight wire or 1 uniformly charged infinite plane sheet. Understanding the behavior of 1 electric dipole placed in 1 uniform external electric field is also 1 highly crucial topic.
To perfectly ensure your excellent and 100 percent strong preparation, we have meticulously selected and prepared completely accurate, high-level, and highly exam-useful objective questions (MCQs) from all these complex topics. By continuously practicing again and again, you will surely learn critical time management and massively increase your speed of solving complex numerical questions without making even 1 single mistake.
Feature: This is 1 3-Level based unique quiz. To unlock the next level (Level 2 and 3), students must score at least 70% in the current level, making their board exam preparation 100% strong.
рдорд╣рддреНрд╡рдкреВрд░реНрдг рдкреНрд░рд╢реНрди (Important Questions)
PDF рдбрд╛рдЙрдирд▓реЛрдб рдХрд░реЗрдВрдЕрдзреНрдпрд╛рдп рдХреЗ рд╕рднреА рдкреНрд░рд╢реНрди (Revision Notes)
*рдиреЛрдЯ: рдпрд╣ рд╕реЗрдХреНрд╢рди рд░рд┐рд╡реАрдЬрди рдХреЗ рд▓рд┐рдП рд╣реИред рдЕрдкрдирд╛ рдЬреНрдЮрд╛рди рдкрд░рдЦрдиреЗ рдХреЗ рд▓рд┐рдП рдКрдкрд░ рджрд┐рдП рдЧрдП рдХреНрд╡рд┐рдЬрд╝ рдореЗрдВ рднрд╛рдЧ рд▓реЗрдВред
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What is the unit of electric charge?
A) Joule | B) Coulomb | C) Watt | D) Volt -
The magnitude of charge on an electron is?
A) 1.6 x 10^-19 C | B) -1.6 x 10^-19 C | C) 9.1 x 10^-31 C | D) 1.6 x 10^19 C -
What is the unit of Electric Field Intensity (E)?
A) Newton/Coulomb | B) Joule/Coulomb | C) Volt-meter | D) Newton-meter -
The formula for quantization of charge is?
A) Q = ne | B) V = IR | C) F = ma | D) E = mc^2 -
Charges of the same nature ......... each other?
A) Attract | B) Repel | C) Neutralize | D) Destroy -
The value of permittivity of free space (╬╡тВА) is?
A) 9 x 10^9 | B) 8.854 x 10^-12 | C) 1.6 x 10^-19 | D) 6.63 x 10^-34 -
The unit of Electric Dipole Moment (p) is?
A) Coulomb-meter | B) Coulomb/meter | C) Newton | D) Faraday -
Electric flux is which type of quantity?
A) Vector | B) Scalar | C) Both | D) None -
The dielectric constant of a metal is?
A) 1 | B) 0 | C) Infinity | D) 10 -
Electric field lines end at?
A) Positive charge | B) Negative charge | C) Infinity | D) Nowhere -
The largest unit of charge is?
A) Coulomb | B) Faraday | C) Ampere | D) Volt -
Rubbing a glass rod with silk produces which charge on the rod?
A) Negative | B) Positive | C) Zero | D) None -
Electric field intensity is a ......... quantity?
A) Scalar | B) Vector | C) Neutral | D) None -
On doubling the distance, the Coulomb force becomes?
A) Double | B) Half | C) One-fourth | D) Four times -
Who discovered the static electric force?
A) Ohm | B) Coulomb | C) Gauss | D) Ampere -
Gauss's law is applicable to?
A) Open surface | B) Closed surface | C) Only sphere | D) None -
Why do electric field lines not intersect each other?
A) They are straight | B) Two directions are not possible | C) They are scalar | D) None -
Electric field inside a conductor is?
A) Infinity | B) Zero | C) Constant | D) Half -
On charging a soap bubble, its radius?
A) Increases | B) Decreases | C) Remains constant | D) Zero -
The flux emerging from a unit charge in air is?
A) ╬╡тВА | B) 1/╬╡тВА | C) 4╧А╬╡тВА | D) Zero -
Electric potential on the equatorial line of a dipole is?
A) Maximum | B) Zero | C) Minimum | D) Constant -
In axial position, intensity (E) depends on?
A) 1/r | B) 1/r^2 | C) 1/r^3 | D) r^2 -
Unit of linear charge density is?
A) C/m | B) C/m^2 | C) C-m | D) N/C -
If net charge is zero, the flux will be?
A) Maximum | B) Zero | C) Minimum | D) Stable -
Unit of surface charge density is?
A) C/m | B) C/m^2 | C) C/m^3 | D) C-m -
Force between charges on placing glass between them?
A) Increases | B) Decreases | C) Zero | D) Constant -
Conservation of charge means charge:
A) Can be created | B) Can be destroyed | C) Is transferred | D) Increases -
Dimensions of electric field (E) are?
A) [MLT^-3A^-1] | B) [ML^2T^-3A^-1] | C) [MLT^-2A^-1] | D) [L^2A^1] -
Net force on a dipole in a uniform field is?
A) pE | B) pE sin╬╕ | C) Zero | D) 2qE -
The smallest unit of charge is?
A) Coulomb | B) Franklin | C) Faraday | D) Milli-coulomb -
Number of electrons in 1 Coulomb charge is?
A) 6.25 x 10^18 | B) 1.6 x 10^-19 | C) 6.023 x 10^23 | D) 9.1 x 10^18 -
Force between two 1C charges at 1m distance is?
A) 1 N | B) 9 x 10^9 N | C) 8.85 x 10^-12 N | D) 9 x 10^-9 N -
Force between an electron and a proton is?
A) Attractive | B) Repulsive | C) Both | D) None -
Electric field at 10cm from 5┬╡C (k=9x10^9)?
A) 4.5 x 10^6 N/C | B) 4.5 x 10^5 N/C | C) 9 x 10^6 N/C | D) 0.45 x 10^6 N/C -
Flux emerging from 8.85 x 10^-12 C charge?
A) 1 | B) 8.85 | C) Zero | D) Infinity -
Which is stronger: Electric force or Gravitational force?
A) Electric force | B) Gravitational force | C) Both equal | D) Uncertain -
Potential at the center of a hollow sphere is 10V, at the surface it will be?
A) 0V | B) 10V | C) 5V | D) 20V -
Field at 5cm inside a 10cm radius sphere is?
A) 14.4 N/C | B) Zero | C) 1.44 N/C | D) Stable -
Force in air is 18N, force at dielectric constant 6 will be?
A) 108N | B) 3N | C) 12N | D) 18N -
Potential energy on bringing an electron closer to another electron?
A) Decreases | B) Increases | C) Zero | D) Constant -
HCl is a permanent dipole because charge centers:
A) Coincide | B) Are separated | C) Change | D) Do not exist -
Unit of electric flux is?
A) Volt-meter | B) Volt/meter | C) Volt-ampere | D) Volt/meter^2 -
Coulomb force is a central force because it acts?
A) In a straight line | B) In a circle | C) Along the line joining centers | D) To infinity -
Charge on ╬▒-particle is how many times the charge of a proton?
A) Equal | B) Double | C) Half | D) Four times -
On halving the distance from a point charge, intensity becomes?
A) Double | B) Half | C) Four times | D) One-fourth
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