Introduction
HSA Notes brings complete, exam-focused solved notes to help Class 11 (1st Year, HSSC-I) students score high marks in their FBISE Physics board exam.
This page covers Unit 10, Electrostatics, prepared strictly according to the FBISE New Book/Course syllabus for the current academic session, covering electric charge, Coulomb’s Law, electric fields, and electric potential, along with fully solved MCQs, short and long responses, numericals, and assignments from HSA Notes.
Charge and Electrostatics
Charge: An intrinsic physical property of matter that causes it to experience and produce electromagnetic force. Charge exists in two types, positive and negative, and like charges repel while unlike charges attract.
Electrostatics: The branch of Physics that studies electric charges at rest, examining the forces, fields, and potentials associated with stationary charge distributions.
Atomic Structure and Charge: Atoms consist of protons, which carry a positive charge, electrons, which carry a negative charge, and neutrons, which carry no charge. The overall charge of an object depends on the balance between the number of protons and electrons it contains.
Methods of Charging: Objects can become charged through three main processes: friction, where charge is transferred between two surfaces rubbed together; conduction, where charge is transferred through direct contact between a charged and an uncharged object; and induction, where a charge distribution is created on a nearby object without direct contact, due to the influence of a charged body.
Coulomb’s Law
Coulomb’s Law describes the electrostatic force between two point charges, stating that this force is directly proportional to the product of the magnitudes of the two charges and inversely proportional to the square of the distance between them. The force acts along the straight line joining the two charges.
F = k |q₁q₂| / r²
where q₁ and q₂ are the magnitudes of the two charges, r is the distance between them, and k is Coulomb’s constant, with a value of:
k = 9 × 10⁹ N·m²/C²
The force is attractive when the two charges have opposite signs and repulsive when they have the same sign, though Coulomb’s Law as written above gives only the magnitude of the force, with direction determined separately along the line joining the charges.
Exercises Solved
This session’s Unit 10 exercise solutions from HSA Notes cover every question type set by FBISE, with full working shown for each answer.
Solved MCQs
- The SI unit of Coulomb’s constant (k) is: N·m²/C²
Short Responses
10.1 State the law of conservation of charge.
The law of conservation of charge states that the total electric charge of an isolated system remains constant over time; charge can neither be created nor destroyed, only transferred from one object to another.
Long Responses
10.1 Derive or explain Coulomb’s Law.
A full explanation of Coulomb’s Law, covering the relationship between force, charge magnitude, and separation distance, along with how the value of Coulomb’s constant k is determined and how the law is applied to point charges in a vacuum or air.
Numericals
10.1 Calculate the electrostatic force between two given point charges separated by a specified distance, using Coulomb’s Law, F = k |q₁q₂| / r², substituting the given values for q₁, q₂, and r.
Assignments
Assignment 10.1 Calculate the electric potential at a given point due to a point charge, using the relevant potential formula and the given values of charge and distance.
HSA Notes Features
- Complete solved MCQs based on the FBISE paper pattern
- Short and long-response questions with clear, detailed answers
- Solved numericals with full working and correct units
- Solved assignments matching the current session’s syllabus
- Solved textbook exercises covering every question
- Full Electrostatics notes for Class 11, based on the FBISE new book/course, available in PDF form at hsanotes.com
Why This Unit Matters
Electrostatics introduces the concept of force acting at a distance without physical contact, a idea that is foundational to nearly all of modern electricity and magnetism.
Available Across All FBISE Institutions
These notes are built for students across all FBISE-affiliated schools and colleges, including Islamabad Model Colleges, F.G. Colleges, Army Public Schools & Colleges, Punjab Colleges, Dr. A.Q. Khan Colleges, Fazaia Inter Colleges, IMCB, IMCG, and Sir Syed Colleges.
Join Online Classes
Join HSA Notes online classes to strengthen your concepts in Electrostatics and every other unit of Class 11 Physics, with regular past paper practice to help you aim for 90 plus marks in your FBISE board exam this session.
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Frequently Asked Questions
What is electric charge?
Electric charge is an intrinsic property of matter that causes it to experience and produce electromagnetic force, existing as either positive or negative, with like charges repelling and unlike charges attracting.
What does Coulomb’s Law state?
Coulomb’s Law states that the electrostatic force between two point charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.
What are the three methods of charging an object?
Objects can be charged by friction, through direct contact known as conduction, or without direct contact through induction.
What is the value of Coulomb’s constant?
Coulomb’s constant, k, has a value of 9 × 10⁹ N·m²/C² in a vacuum or air.
Conclusion
With Unit 10, Electrostatics, fully covered, Class 11 FBISE students now have a clear understanding of electric charge, Coulomb’s Law, electric fields, and electric potential, along with fully solved MCQs, short and long responses, numericals, and assignments for this session. Practice these solved exercises alongside past papers, and consider joining our online classes for guided, exam-focused preparation, to build the accuracy and confidence needed for your board exam.
Best of luck for your Class 11 Physics exam!