Скачать или смотреть Class 12 Physics Exam Hacks 🎯 | Top 3 Marks Questions You Must Know – Part 4

Ace your Class 12 Physics Board Exam 2025 with this Part 4 video of the most important 3 Marks Questions from Section C. In this session, we cover high-scoring questions along with expert tips on how to write perfect answers. Boost your confidence with this quick revision guide and secure full marks in your exam.

✅ Topics Covered:
✔️ Sure-shot 3 Marks Questions for Physics Board Exam 2025
✔️ Concept-based Answer Writing Tips
✔️ Most Expected & Leaked Questions for Board Exams
✔️ Common Mistakes to Avoid
✔️ Best Strategies to Score 90+ in Physics

🔗 Previous Parts:
📌 Part 1:    • Class 12 Physics Practice Paper 2025 ✍️ | ...  
📌 Part 2:    • Class 12 Physics Board Exam 🔥 Leaked 3-Mar...  
📌 Part 3: [   • Class 12 Physics 2025 🔥 3-Mark Questions Y...  ]

Objective Questions
📌 Part 1:    • Class 12 Physics Practice Paper 2025 💀 | M...  
📌 Part 2:    • Class 12 Physics Practice Paper 2025 💀 | O...  
📌 Part 3: [   • Class 12 Physics 2025 Practice 💡 | How to ...  ]
📌 Part 4: [   • Class 12 Physics Practice Paper💡 | Ultimat...  ]

Section B :    • Class 12 Physics Section B 🔥 | Complete Co...  

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Definitions & Key Concepts Covered:

🔹 Drift Velocity: The average velocity attained by charge carriers (electrons) in a conductor due to an electric field. It is given by v_d = I / (nAq), where I is the current, n is the charge carrier density, A is the cross-sectional area, and q is the charge of an electron.

🔹 Relaxation Time: The average time between successive collisions of an electron in a conductor. It affects the electrical conductivity of a material.

🔹 Current Density (J): The amount of electric current flowing per unit area of a conductor, given by J = I/A.

🔹 Resistivity (ρ): A material's intrinsic property that opposes the flow of current. It is given by ρ = R A / L, where R is resistance, A is cross-sectional area, and L is length.

🔹 Resistance (R): The opposition a conductor offers to the flow of electric current, calculated by R = V/I (Ohm's Law).

🔹 Conductivity (σ): The reciprocal of resistivity, indicating a material's ability to conduct electricity, given by σ = 1/ρ.

🔹 Magnetic Dipole Moment: A measure of the strength and orientation of a magnetic source, given by M = m × 2L, where m is pole strength and 2L is the magnetic length.

🔹 Magnetic Flux (Φ): The total number of magnetic field lines passing through a surface, given by Φ = B × A × cos(θ).

🔹 Ampere's Law: It states that the line integral of the magnetic field B around a closed path is equal to μ₀ times the total current enclosed, i.e., ∮ B.dl = μ₀ I.

🔹 Nuclear Properties: Characteristics of atomic nuclei, including mass, charge, size, binding energy, and stability.

🔹 Capacitance (C): The ability of a system to store electric charge, given by C = Q/V, where Q is charge and V is voltage.

🔹 Factors Affecting Mutual Inductance:
1️⃣ Number of Turns – More turns increase inductance
2️⃣ Core Material – Ferromagnetic materials enhance inductance
3️⃣ Separation Distance – Closer coils result in stronger mutual inductance
4️⃣ Orientation of Coils – Parallel placement increases inductance


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Your Queries Answered:

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🔍 Physics 3 Marks Questions for Class 12
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🔍 Electrostatics, Current Electricity, Magnetism, EMI, Modern Physics Important Questions

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