Arjuna NEET 4.0 2026 Physics Wallah

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PYQs Marked Notes 📝
Most Important Questions ✅
Unlimited Practice 🔥

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Only first 200 students can get it for free ⚡️

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Jab exam shuru hoga remember to stay calm. Read the questions carefully. Manage your time wisely. And believe in yourself. You've prepared for this. Give it your best shot!♥️🔥

Electric Charges and Fields

1. Electric Charge Charge is the property associated with matter due to which it produces and experiences electric and magnetic effect.

2. Conductors and Insulators Those substances which readily allow the passage of electricity through them are called conductors, e.g. metals, the earth and those substances which offer high resistance to the passage of electricity are called insulators, e.g. plastic rod and nylon.

3. Transference of electrons is the cause of frictional electricity.

4. Additivity of Charges- Charge are scalars and they add up like real numbers. It means if a system consists of n charges q1, q2, q3 , … ,qn, then total charge of the system will be q1 +q2 + … +qn.

5. Conservation of Charge The total charge of an isolated system is always conserved, i.e. initial and final charge of the system will be same.

6. Quantisation of Charge -Charge exists in discrete amount rather than continuous value and hence, quantised.

Mathematically, charge on an object, q=±ne
where, n is an integer and e is electronic charge. When any physical quantity exists in discrete packets rather than in continuous amount, the quantity is said to be quantised. Hence, charge is quantised.

7. Units of Charge

(i) SI unit coulomb (C)
(ii) CGS system

(a) electrostatic unit, esu of charge or stat-coulomb (stat-C)

(b) electromagnetic unit, emu of charge or ab-C (ab-coulomb)
1 ab-C = 10 C, 1 C = 3 x 109 stat-C

Happy Republic Day! 🇮🇳🇮🇳
सारे जहाँ से अच्छा हिन्दोसिताँ हमारा
JAI 🇮🇳HIND🇮🇳dosto

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ℙ𝕝𝕒𝕟𝕔𝕜'𝕤 ℚ𝕦𝕒𝕟𝕥𝕦𝕞 𝕋𝕙𝕖𝕠𝕣𝕪
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❖ Substances that absorb or emit light discontinuously in the form of small packets or bundles.

❖ The smallest packet of energy is called quantum (plural quanta).

❖ The radiation is propagated in the form of waves.

❖ The energy of a quantum is directly proportional to the frequency of the radiation

            E ∝ v
            E = hv
            E = (hc)/ λ =hc v

Where E = Energy of radiation
             h = Planck's constant
                = 6.626 10^-27 erg .sec
                = 6.626 * 10^-34 Joule.sec

❖ A body that can absorb or emit energy in whole number multiple of quantum.

            E = nhv

Where n = 1, 2, 3, 4

❖ The frequency of emitted radiation goes from lower to higher as the temperature increases.

Ligand strength ka direct question aata hai usually Exam me......

I⁻ < Br⁻ < SCN⁻ < Cl⁻ < S²⁻ < F⁻ < OH⁻ < C₂O₄²⁻ < H₂O < NCS⁻ < edta⁴⁻ < NH₃ < en < CN⁻ < CO

Biotechnology Application

NEET PYQS

Pest Resistant Plants

✓Nematode Meloidegyne incognita
   infects the Roots of Tobacco plants.

✓Novel strategy was adopted to prevent
   this infestation which was based on
   the process of RNA Interference (RNAi)

✓RNAi takes place in all Eukaryotic
   Organisms as a method of Cellular
   Defence

✓RNAi involves silencing of a specific
   mRNA
   (Due to a complementary ds-RNA
   molecule that binds to and prevents
   translation of the mRNA/Silencing)

✓Mobile Genetic Elements (Transposons)

  Give Hearts ❤️❤️