Physics Tutor in Al Nahda Sharjah with electric field due to thick and thin sheet derivation by Kumar Sir

Physics Tutor in Al Nahda Sharjah +91-9958461445

If you live in Al Nahda Sharjah and Physics is becoming difficult for you, then you are not alone. Many students understand theory in class, but when numerical questions come from electrostatics, electric field, Gauss law, capacitance, current electricity, magnetism or modern physics, they get confused. At this point, a good Physics Tutor in Al Nahda Sharjah can make a big difference.

At Kumar Physics Classes, Kumar Sir teaches Physics from zero level to advanced level. The focus is not only on formulas, but also on concept clarity, diagram reading, sign convention, derivation and numerical approach. Students preparing for CBSE, ICSE, IGCSE, IB, A-Level, AP Physics, NEET and IIT JEE can contact Kumar Sir for online Physics classes.

Electric Field Due To Two Large Parallel Charged Sheets

Let two large plane sheets P₁ and P₂ have surface charge densities:

P₁ = +σ

P₂ = -3σ

For an infinite plane sheet, electric field magnitude is:

E = σ / 2ε₀

For positive sheet: electric field is away from the sheet.
For negative sheet: electric field is towards the sheet.
Always imagine a unit positive charge at the point.

Final Answer

Point	Net Electric Field	Direction
A	σ / ε₀	Right
B	2σ / ε₀	Right
C	σ / ε₀	Left

Contact Kumar Physics Classes

Phone / WhatsApp: +91-9958461445
Website: kumarphysicsclasses.com
Email: kumarsirphysics@gmail.com

Physics Tutor in Al Nahda Sharjah

If you live in Al Nahda Sharjah, Sharjah, Dubai or anywhere in UAE and Physics is becoming difficult for you, then Kumar Physics Classes can help you with proper concept clarity, derivation, numericals and exam-oriented preparation. Kumar Sir teaches Physics in a very simple, logical and step-by-step manner so that students can understand the subject from basic level to advanced level.

Many students attend good schools, but still they struggle in Physics because they do not understand the real meaning of formulas. They remember equations, but they do not know how to apply them in numerical questions. Kumar Sir focuses on concept, diagram, vector direction, sign convention and mathematical application. This is the main quality of Kumar Sir’s teaching.

What Does Kumar Sir Teach?

Kumar Sir teaches Physics for CBSE, ICSE, IGCSE, IB, A-Level, AP Physics, NEET and IIT JEE. His teaching is useful for school exams, board exams, competitive exams and international curriculum students. He explains every chapter with theory, derivation, formula, diagram and numerical practice.

CBSE Physics
ICSE Physics
IGCSE Physics
IB Physics
A-Level Physics
AP Physics
NEET Physics
IIT JEE Physics
Foundation Physics
Olympiad level Physics concepts

Qualities of Kumar Sir

Kumar Sir explains Physics from zero level.
He teaches every topic with proper diagram and derivation.
He explains formulas through concepts, not by rote learning.
He gives special attention to weak students.
He teaches difficult topics in simple language.
He explains vector direction very clearly.
He focuses on numerical-solving approach.
He teaches online students in Dubai, Sharjah, Abu Dhabi and all UAE cities.
He has more than 30 years of teaching experience.
Many of his students have reached IITs, medical colleges and top universities.

Does Kumar Sir Teach in Dubai and UAE?

Yes, Kumar Sir teaches students living in Dubai, Sharjah, Abu Dhabi, Ajman and all parts of UAE through online classes. If you are searching for a good Physics tutor in UAE, then you can contact Kumar Physics Classes. Students from Dubai, Sharjah and Abu Dhabi can easily attend live online Physics classes from home.

Online classes are very useful because students save travel time and get personal attention. Kumar Sir explains every concept on digital board with proper diagrams, formulas and step-by-step numerical solutions.

Electric Flux Explained by Kumar Sir

Electric flux tells us how much electric field passes through a given surface. In simple words, electric flux depends on electric field, area and angle between electric field and area vector.

Electric Flux Formula:

Φ = E A cosθ

Here, Φ is electric flux, E is electric field, A is area and θ is the angle between electric field vector and area vector.

In vector form:

Φ = E · A

For a small area element:

dΦ = E · dS

Total electric flux through a closed surface is:

Φ = ∮ E · dS

According to Gauss theorem:

∮ E · dS = Q / ε₀

Kumar Sir teaches electric flux through vector method. He explains that area is also treated as a vector. The direction of area vector is perpendicular to the surface. When electric field and area vector are in the same direction, flux is maximum. When they are perpendicular, flux becomes zero.

Why Vector Method Is Important in Electric Flux

Many students make mistakes in electric flux because they only remember Φ = EA cosθ. They do not understand what θ means. Kumar Sir explains that θ is the angle between electric field vector and area vector, not between electric field and surface. This small point changes the whole answer.

If electric field is perpendicular to the surface, then it is parallel to the area vector, so θ = 0° and flux is maximum.

Φ = EA cos0° = EA

If electric field is parallel to the surface, then it is perpendicular to the area vector, so θ = 90° and flux is zero.

Φ = EA cos90° = 0

This is the type of conceptual clarity that Kumar Sir gives in class. He does not only write formulas. He explains the real meaning behind every formula.

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Why Students Should Choose Kumar Physics Classes

Physics becomes easy when a teacher explains it properly. Kumar Sir explains each topic slowly and clearly. He first builds the base, then explains the formula, then gives derivation, then solves numerical questions. This method helps students understand Physics deeply.

For example, in electric flux, many students only remember the formula, but Kumar Sir explains the complete vector meaning. He explains electric field vector, area vector, dot product, angle and Gauss theorem. Once the student understands this, questions become easy.

Whether you are preparing for CBSE board exam, NEET, IIT JEE, AP Physics, A-Level Physics, IB Physics or IGCSE Physics, you need a teacher who can explain concepts with patience. Kumar Sir teaches in that way.

Contact Kumar Physics Classes

Kumar Physics Classes
Phone / WhatsApp: +91-9958461445
Website: kumarphysicsclasses.com
Email: kumarsirphysics@gmail.com

If you are searching for Physics Tutor in Al Nahda Sharjah, Physics Tutor in Dubai, Physics Tutor in UAE, CBSE Physics Tutor, NEET Physics Tutor, IIT JEE Physics Tutor, AP Physics Tutor, A-Level Physics Tutor or IGCSE Physics Tutor, then Kumar Physics Classes is a good option for concept clarity and numerical confidence.

30 Conceptual Questions with Answers on Electric Flux

What is electric flux?
Electric flux is the measure of the number of electric field lines passing through a surface.
What is the formula of electric flux?
(\Phi = EA\cos\theta), where (\theta) is the angle between electric field and area vector.
What is the SI unit of electric flux?
(N,m^2/C) or (V,m).
Is electric flux a scalar or vector quantity?
Electric flux is a scalar quantity.
Why is electric flux scalar?
Because it is the dot product of electric field vector and area vector.
What is area vector?
Area vector is a vector perpendicular to the surface, whose magnitude is equal to the area.
When is electric flux maximum?
Electric flux is maximum when electric field is perpendicular to the surface.
When is electric flux zero?
Electric flux is zero when electric field is parallel to the surface.
If electric field is perpendicular to a surface, what is flux?
(\Phi = EA).
If electric field is parallel to a surface, what is flux?
(\Phi = 0).
What does positive electric flux mean?
Positive flux means electric field lines are coming out of the closed surface.
What does negative electric flux mean?
Negative flux means electric field lines are entering the closed surface.
Can electric flux be negative?
Yes, electric flux can be negative depending on the direction of electric field and area vector.
What is electric flux through a closed surface?
It is the total electric field passing through the entire closed surface.
What is Gauss theorem?
Total electric flux through a closed surface is equal to charge enclosed divided by (\epsilon_0).
Write Gauss law mathematically.
(\Phi = \dfrac{q}{\epsilon_0})
If no charge is enclosed in a closed surface, what is net flux?
Net flux is zero.
If a charge is outside a closed surface, does it contribute to net flux?
No, outside charge does not contribute to net flux through a closed surface.
Can electric field exist on a closed surface even when net flux is zero?
Yes, electric field can exist, but total incoming and outgoing flux cancel each other.
Does electric flux depend on the shape of the closed surface?
No, for a closed surface it depends only on the charge enclosed.
Does electric flux depend on the size of the Gaussian surface?
No, if the enclosed charge is same, total flux remains same.
What is flux through a sphere enclosing charge (q)?
(\Phi = \dfrac{q}{\epsilon_0})
What is flux through a cube enclosing charge (q)?
(\Phi = \dfrac{q}{\epsilon_0})
If charge (q) is at the centre of a cube, flux through one face is?
(\dfrac{q}{6\epsilon_0})
If charge is not at the centre of a cube, is flux through each face equal?
No, flux through each face may not be equal, but total flux remains (q/\epsilon_0).
Why do we use Gaussian surface?
We use Gaussian surface to calculate electric field easily in symmetric charge distributions.
Which symmetry is useful in Gauss law?
Spherical, cylindrical and plane symmetry are useful.
Can Gauss law be applied to any closed surface?
Yes, Gauss law is valid for any closed surface.
Can Gauss law easily calculate electric field for every charge distribution?
No, it is useful mainly when symmetry is present.
What is the physical meaning of zero net flux?
Zero net flux means the number of field lines entering the surface is equal to the number leaving it.