Electrostatics – Hub of related Posts

Here goes the list of our posts on Electrostatics and related topics and subtopics.

Gaussian surface – definition, examples, properties

In this post, we will cover the definition of Gaussian surface and its examples. We will also study the properties of the Gaussian surface. [ Read Gauss' Law statement and ...
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Capacitors and their usage

Capacitors and their usage is the topic of this post. The capacitor is a component that has the ability or "capacity" to store energy in the form of an electrical ...
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Capacitors and dielectric – Question & Answer

In this post, we have presented fundamental and conceptual questions and answers based on parallel plate capacitors and dielectrics between the plates. This Capacitor and dielectric Question set will certainly ...
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Charging and Discharging of a Capacitor

A capacitor is charged by connecting it to a battery or to a constant-voltage power supply to create a circuit. Charge flows to the capacitor from the battery or power ...
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Conducting sphere – Questions (multiple choice MCQ)

1) A hollow, conducting sphere is initially uncharged. A positive charge, +q1, is placed inside the sphere, as shown in the figure. Then, a second positive charge, +q2, is placed ...
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The electrostatic field inside any isolated conductor is always zero

The electrostatic field inside any isolated conductor is always zero. In a cavity in a conductor, the net charge and the electric field are always zero. Let's see how we ...
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Energy Stored in Capacitors – numerical worksheet

In this post, we have presented a collection of numerical problems on Energy Stored in Capacitors in the form of a numerical worksheet. This is good for grade 11 and ...
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Parallel-Plate Capacitors – numerical worksheet

In this post, we have presented a collection of numerical problems on Parallel-plate capacitors in the form of a numerical worksheet. This is good for grade 11 and grade 12 ...
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Polarization of a Dielectric between parallel plates of a capacitor

In this post, we will see how Polarization of a Dielectric between parallel plates of a capacitor happens with the help of an external electric field. The potential difference V0 ...
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Numerical problem on dielectric strength of capacitor

In this post, we will solve a numerical problem on the dielectric strength and dielectric constant of capacitor, maximum electric field, maximum potential difference, maximum charge, etc. Numerical problem on ...
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Electrolytic Capacitors

An electrolytic capacitor is often used to store large amounts of charge at relatively low voltages. Structure of electrolytic capacitors | dielectric formation This device, shown in Figure 1, consists ...
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Dielectric strength

Dielectric strength of a dielectric is the maximum electric field that the dielectric can withstand with its insulating properties intact. In other words, the dielectric strength equals the maximum electric ...
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Series Combination of capacitors

Series Combination of capacitors Two capacitors connected as shown in Figure 1a and the equivalent circuit diagram in Figure 1b are known as a series combination of capacitors. The left ...
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Parallel Combination of capacitors

Parallel Combination of capacitors Two capacitors connected as shown in Figure 1a are known as a parallel combination of capacitors. Figure 1b shows a circuit diagram for this combination of ...
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Energy density in charged parallel plate capacitor

In this post, we will derive the equation of the Energy density in charged parallel plate capacitor. Energy stored in parallel plate capacitor U = (1/2) C V2 where, C ...
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Energy stored in combination of Capacitors

Energy stored in combination of Capacitors equals the sum of the energies stored in individual capacitors. Let's see how we can show this mathematically using equations. To find out the ...
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Defibrillator

Defibrillator - application of Capacitors in the medical field One gadget in which capacitors play a significant role is the defibrillator. A defibrillator has a large capacitor and when it ...
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Voltage – Work done in separating charges

In this post, we discuss the concept of voltage (or Potential Difference) in terms of work done in separating charges. Moving charges give rise to electricity. For charges to move, ...
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Capacitance of parallel plate capacitor – formula derivation

At a point between two plates of the parallel plate capacitor, the Electric field generated by the combined effect of the 2 plates of the capacitor can be expressed as: ...
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Bending Water stream by charged rubber rod – how?

When a charged rubber rod is brought close to a thin stream of water, the water is attracted toward the rod and the stream is bent. Water molecules have a ...
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Touch screens: resistive & capacitive – working principle

Touch screens are quite common these days. In this post, we will discuss the physics behind the working principles of different touch screens. Specifically speaking, we will cover here the ...
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How charged rubber comb attracts pieces of paper?

When a negatively charged rubber comb is brought near small pieces of paper, the charges in the paper molecules are acted on by electric forces - positive charges are attracted, ...
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Law of charges & Coulomb’s law – difference

In this post, we will talk about the difference between the law of charges & Coulomb’s law. An electric force exists between any two charged particles. On observation, it is ...
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Capacitor & Capacitance – formulas

A bunch of important formulas related to Capacitance & capacitors are listed below. capacitance of a conductor & capacitance of a spherical conductor - formulas capacitance of a conductor & ...
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Principle of a capacitor – step by step

Principle of a capacitor The principle of a capacitor is based on two physical events. These are as follows: 1 ) The capacitance of a conductor increases by a small ...
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Capacitance of a Spherical Conductor (with formula derivation)

In this post, we will discuss and derive the formula of the Capacitance of a Spherical Conductor. derivation of the Capacitance of a Spherical Conductor Suppose an isolated spherical conductor ...
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Electric field due to two infinite plane parallel sheets of charge

Consider two infinite plane parallel sheets of charge A and B, having surface charge densities equal to σ1 and σ2 respectively. (see the figures 1 to 4 in the following ...
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Faraday Cage & lightning

In this post, we will find out what a Faraday cage is and how this is related to lightning strikes. What is a Faraday Cage? A Faraday Cage, named after ...
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Van de Graaff generator – important questions

In one of the earlier posts, we discussed the working principle and the physical structure of the Van de Graaff generator. In this post, we will answer a few important ...
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Class 12 Physics Question Bank – Electrostatics

This post presents a Physics Question Bank for class 12 covering the Electrostatics chapter. Definition type questions from the Electrostatics chapter 1) Define electric flux. 2) Define electric dipole moment ...
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Equilibrium of electric forces on charges on one line & formulas

In this post, we will take a few cases where the Equilibrium of electric forces on charges on one line happens. In every case, there are 3 charges on one ...
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Drawing the field lines due to a dipole

How to draw the field lines due to a dipole? figure 1: field lines due to a dipole Fig. 1 depicts the field lines due to a dipole. For a ...
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Electric Field due to a Plane Sheet of Charge

Electric Field due to a thin infinite Plane Sheet of Charge In this section, we will derive the equation for the Electric Field due to a thin infinite Plane Sheet ...
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electrostatics – Worksheet 1 problem solution (Q4)

4) A positively charged object Q is placed as shown in the sketch. The potential difference between two points A and B is 4 x 10-4 V. (a) Calculate the ...
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electrostatics – Worksheet 1 problem solution (Q3)

3 ) A charge of +5nC is moved by a distance of 4 cm against a uniform electric field of magnitude 2 x 1012 NC-1 from A to B. (a) ...
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electrostatics – Worksheet 1 problem solution (Q2)

Question 2) In the picture below, X is a small negatively charged sphere with a mass of 10kg. It is suspended from the roof by an insulating rope which makes ...
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electrostatics – Worksheet 1 problem solution (Q1)

1 ) Determine the electrostatic force and gravitational force between two electrons 1ºA apart (i.e. the forces felt inside an atom) [ here is the complete worksheet: electrostatics worksheet 1 ...
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Numerical problems on Electrostatics – worksheet 1

In this post, we publish a worksheet containing a bunch of numerical problems from the Electrostatics chapter of HS physics. This numerical set includes problems based on Coulomb's force or ...
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Electric Field Due to a Short Dipole – formulas

In this post, we will study 2 formulas of the electric field due to a short dipole. These electric field formulas represent the following: (1) Electric Field Due to a ...
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Electric flux – definition, formula

Electric flux - definition, formula - In this post, we will define electric flux and study its equation. We will also study a few figures that come with numerical problems ...
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Electric Charge

In this post, we will understand the fundamentals of Electric Charge through a set of questions and their answers. What is the electric charge? Electric charge is a physical property ...
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Electrical Potential difference & mechanical work – numerical problems

The potential difference between two points in a circuit is the electrical energy per unit charge. When this electrical energy is converted into other forms of energy (thermal, light, mechanical, ...
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Motion of a charged particle in an electric field between parallel plates – derivation of formulas

In this post, we will analyze different scenarios of the motion of a charged particle in an electric field between two parallel plates. Scenario 1: motion of a charge between ...
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Equipotentials between two oppositely charged parallel plates – explanation

figure 1: Lines of equal potential The lines of equal potential difference between two parallel plates resemble those shown in figure 1. These lines are called equipotentials because they represent ...
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Properties of the Electric field between two oppositely charged parallel plates

The electric field between two parallel plates:- is uniform in the region between the plates- becomes weaker at the edges (these are known as edge effects) as the field changes ...
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Numerical problems on electric potential energy

In this post, we will solve Numerical problems on electric potential energy. [Electric potential energy is also known as electrical potential energy] Numerical Problem based on electrical potential energy Suppose ...
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Numerical problems based on the motion of a charge in a uniform electric field between two parallel plates

In this post, let's solve Numerical problems based on the motion of a charge in a uniform electric field between two parallel plates. In the case of the motion of ...
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Numerical problem based on electric field between charged parallel plates

Here, we will solve a set of Numerical Problems based on the formula of the electric field between two charged parallel plates. Numerical Problem (Physics) - based on the formula ...
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Derive formulas of electric field & potential difference between charged plates

Here we will derive the formulas of electric field & potential difference between charged plates. fundamentals Now, let's see some of the facts we need to know (or revise) first, ...
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Charge distribution in two oppositely charged parallel metal plates

In this post, we will find how the charges are distributed if two parallel metal plates are oppositely charged. We will also know about the Electric field lines between two ...
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