Physics Tutor in Al Reem Island
+91-9958461445

If you live in Al Reem Island, Abu Dhabi, and Physics is becoming a headache for you, then you are on the right page. Many students study in good schools, attend classes regularly, make notes, and still feel that Physics is not clear. When numerical questions come in exams, the answer does not come. Then slowly fear starts building: low marks, parents’ pressure, test anxiety, compartment fear, and loss of confidence.

But the real problem is not that the student is weak. The real problem is that Physics has not been explained in the correct way.

At Kumar Physics Classes, Kumar Sir teaches Physics from basic to advanced level for CBSE, ICSE, IGCSE, IB, A-Level, AP Physics, NEET and IIT JEE students. If you are searching for a Physics Tutor in Al Reem Island, Kumar Sir can help you build strong concepts, solve numerical problems, and understand derivations properly.

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

Why Students in Al Reem Island Need a Good Physics Tutor

Physics is not a subject of simple memorisation. In Physics, every formula has a meaning. Every numerical question has a hidden concept. If the student only remembers formulas but does not understand how to apply them, then even simple questions become difficult.

Many students face these problems:

• They know Coulomb’s law but cannot apply it.

• They know the formula but do not understand unit conversion.

• They make mistakes in micro coulomb, metre, square, and power of ten.

• They get confused when quadratic equations come.

• They waste time in lengthy calculation.

• They lose marks even after knowing the chapter.

This is why a concept-based teacher is required.

Electrostatics Numerical: Two Positive Charges Repel Each Other

Now let us understand one very important electrostatics question in Kumar Sir style.

Question

Two positive point charges are 0.1 m apart and repel each other with a force of 18 N. If the sum of the charges is 9 micro coulomb, calculate their separate values.

Given:

r = 0.1 m
F = 18 N
q1 + q2 = 9 × 10^-6 C
k = 1 / 4πε0 = 9 × 10^9 Nm²/C²

By Coulomb’s law:

F = k q1 q2 / r²

Put the values:

18 = (9 × 10^9 × q1 q2) / (0.1)²

Now:

(0.1)² = 0.01

So:

18 = (9 × 10^9 × q1 q2) / 0.01

Therefore:

q1 q2 = (18 × 0.01) / (9 × 10^9)

q1 q2 = 0.18 / (9 × 10^9)

q1 q2 = 2 × 10^-11 C²

Now we know:

q1 + q2 = 9 × 10^-6 C

and

q1 q2 = 2 × 10^-11 C²

Usually students make a quadratic equation here, but Kumar Sir teaches a faster method.

Use identity:

(q1 - q2)² = (q1 + q2)² - 4q1q2

Now put values:

(q1 - q2)² = (9 × 10^-6)² - 4(2 × 10^-11)

(q1 - q2)² = 81 × 10^-12 - 8 × 10^-11

Write both in same power:

8 × 10^-11 = 80 × 10^-12

So:

(q1 - q2)² = 81 × 10^-12 - 80 × 10^-12

(q1 - q2)² = 1 × 10^-12

Therefore:

q1 - q2 = 1 × 10^-6 C

Now we have:

q1 + q2 = 9 × 10^-6 C

q1 - q2 = 1 × 10^-6 C

Add both equations:

2q1 = 10 × 10^-6

q1 = 5 × 10^-6 C

So:

q1 = 5 μC

Now:

q2 = 9 μC - 5 μC

q2 = 4 μC

Final answer:

q1 = 5 μC
q2 = 4 μC

Kumar Sir Style Explanation

See beta, the main game is not Coulomb’s law only. The main game is calculation handling.

If you directly make quadratic equation:

x(9 - x) = something

then many students get confused. But if you use:

(q1 - q2)² = (q1 + q2)² - 4q1q2

then the answer comes very smoothly.

This is a very powerful method for electrostatics numerical questions where:

q1 + q2 is given
q1 q2 is found from Coulomb’s law

Then easily find:

q1 - q2

After that:

q1 = [(q1 + q2) + (q1 - q2)] / 2

q2 = [(q1 + q2) - (q1 - q2)] / 2

This is how Physics becomes simple when the teacher explains the correct method.

Physics Tutor in Schools Near Al Reem Island

If your child studies near Al Reem Island and needs Physics support, Kumar Physics Classes can help through online classes.

Physics Tutor in Repton School Abu Dhabi, Physics Tutor in GEMS World Academy Abu Dhabi, Physics Tutor in Nord Anglia International School Abu Dhabi, Physics Tutor in Cranleigh Abu Dhabi, Physics Tutor in Raha International School, Physics Tutor in Abu Dhabi Grammar School, Physics Tutor in The British School Al Khubairat, Physics Tutor in Brighton College Abu Dhabi, Physics Tutor in Canadian International School Abu Dhabi, Physics Tutor in Al Yasmina Academy

Physics Tutor in Universities and Institutes Near Al Reem Island

Students preparing for entrance exams or university-level Physics can also contact Kumar Sir.

Physics Tutor in New York University Abu Dhabi, Physics Tutor in Khalifa University, Physics Tutor in Abu Dhabi University, Physics Tutor in Sorbonne University Abu Dhabi, Physics Tutor in Zayed University Abu Dhabi, Physics Tutor in Aakash Institute Abu Dhabi, Physics Tutor in Allen Abu Dhabi, Physics Tutor in NEET Coaching Abu Dhabi, Physics Tutor in IIT JEE Coaching Abu Dhabi

Physics Courses Offered by Kumar Physics Classes

CBSE Physics Tutor in Al Reem Island
ICSE Physics Tutor in Al Reem Island
IGCSE Physics Tutor in Al Reem Island
IB Physics Tutor in Al Reem Island
A-Level Physics Tutor in Al Reem Island
AP Physics Tutor in Al Reem Island
NEET Physics Tutor in Al Reem Island
IIT JEE Physics Tutor in Al Reem Island

Why Kumar Sir’s Method Works

Kumar Sir does not teach Physics like simple formula memorisation. He explains:

• basic concept

• diagram

• formula

• derivation

• numerical method

• shortcut where required

• common mistakes

• exam application

For example, in the electrostatics question above, many students know Coulomb’s law, but they get stuck in quadratic equation. Kumar Sir shows how to use identity and solve the question quickly.

This is the difference between ordinary teaching and concept-based teaching.

Online Physics Tutor in Al Reem Island

Even if Kumar Sir is in India and you are in Abu Dhabi, you can easily study online. Online Physics classes are very effective when the teacher explains properly using digital board, diagrams, derivations, and regular numerical practice.

Students from Al Reem Island can attend live online classes for:

• school Physics

• board exam preparation

• NEET Physics

• IIT JEE Physics

• AP Physics

• IB Physics

• IGCSE Physics

• A-Level Physics

Contact Kumar Physics Classes

If you live in Al Reem Island and Physics is not clear, do not wait until marks go down badly. Start concept-based learning early.

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

Physics becomes easy when the teacher explains it in the right way. If you want strong concepts, better numerical solving, and proper exam preparation, contact Kumar Sir today.

Properties of Positive and Negative Charge

Positive Charge

• A body becomes positively charged when it loses electrons.

• Positive charge is denoted by +q.

• It attracts negative charge and repels positive charge.

• Example: proton has positive charge +e.

Negative Charge

• A body becomes negatively charged when it gains electrons.

• Negative charge is denoted by -q.

• It attracts positive charge and repels negative charge.

• Example: electron has negative charge -e.

Common Properties of Charge

• Like charges repel each other.

• Unlike charges attract each other.

• Charge is conserved.

• Charge is quantized:
  q = ne
  where n = integer and e = 1.6 × 10^-19 C.

• Charge is additive.

• Charge is independent of speed.

Electrostatic Induction

Electrostatic induction is the process of charging a body without direct contact.

When a charged body is brought near a neutral conductor, charges inside the conductor rearrange themselves.

Example:
If a negatively charged rod is brought near a neutral metal sphere:

• Electrons in the sphere are repelled.

• Near side becomes positive.

• Far side becomes negative.

• Net charge of sphere is still zero unless it is grounded.

If the sphere is grounded while the rod is near, electrons flow to earth. After removing ground and then removing the rod, the sphere becomes positively charged.

Is There Any Charge Smaller Than Electron Charge?

In normal electrostatics, the smallest free charge is the charge of an electron:

e = 1.6 × 10^-19 C

So, in school Physics:

q = ne

where n is always an integer.

But in particle physics, quarks have fractional charges:

• Up quark: +2e/3

• Down quark: -e/3

However, quarks are not found freely in normal conditions. That is why for CBSE/NEET/JEE electrostatics, electron charge is treated as the smallest free charge.

20 Conceptual Questions

1. Why does a body become positively charged when it loses electrons?

2. Why does a body become negatively charged when it gains electrons?

3. Can a body have charge equal to 0.5e in normal electrostatics? Why?

4. Why do like charges repel each other?

5. Why do unlike charges attract each other?

6. If a neutral body has equal positive and negative charges, why is its net charge zero?

7. What is meant by conservation of charge?

8. Why is charge said to be quantized?

9. Can charge exist without mass?

10. Why is the charge of a proton positive and the charge of an electron negative?

11. What happens inside a neutral conductor when a charged rod is brought near it?

12. In electrostatic induction, why is direct contact not required?

13. If a negatively charged rod is brought near a neutral sphere, why does the near side become positive?

14. Why does grounding help in charging by induction?

15. After induction, why does the induced charge become opposite to the charge of the rod?

16. Can an insulator be charged by induction in the same way as a conductor?

17. Why do electrons move easily in conductors but not in insulators?

18. If quarks have fractional charge, why do we still say charge is quantized as q = ne in school Physics?

19. Why are quarks not considered free charges in ordinary electrostatics?

20. Why is electrostatic induction important in understanding lightning and earthing?