COMEDK UGET Physics - Electromagnetism and Modern Physics Syllabus

Physics - Electromagnetism and Modern Physics syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Physics - Electromagnetism and Modern Physics in COMEDK UGET, not a summary of it.

1. 1

   Electrostatics

   3 topics

   • Electric Charges and Fields
     • Coulomb's law
     • Electric field and field lines
     • Gauss's law and applications
   • Electrostatic Potential and Capacitance
     • Potential due to point charge and dipole
     • Capacitors and combinations
     • Energy stored and dielectrics
   • Electric Dipole
     • Dipole moment
     • Torque on a dipole in a field
2. 2

   Current Electricity

   3 topics

   • Ohm's Law and Resistance
     • Ohm's law and resistivity
     • Temperature dependence of resistance
     • Combination of resistors
   • Electrical Circuits
     • Kirchhoff's laws
     • Wheatstone bridge and meter bridge
     • Potentiometer
   • Cells and Heating Effects
     • Cells, EMF and internal resistance
     • Joule's law of heating
3. 3

   Magnetic Effects and Magnetism

   3 topics

   • Moving Charges and Magnetism
     • Biot-Savart and Ampere's law
     • Force on a current-carrying conductor
     • Moving coil galvanometer
   • Magnetism and Matter
     • Bar magnet and magnetic dipole
     • Dia, para and ferromagnetism
     • Earth's magnetism
   • Magnetic Force and Cyclotron
     • Lorentz force on a moving charge
     • Motion in combined electric and magnetic fields
     • Cyclotron
4. 4

   Electromagnetic Induction and AC

   3 topics

   • Electromagnetic Induction
     • Faraday's and Lenz's laws
     • Self and mutual inductance
     • Eddy currents
   • Alternating Current
     • AC through R, L, C circuits
     • LCR series resonance
     • Transformers and power in AC
   • Electromagnetic Waves
     • Displacement current
     • Electromagnetic spectrum
5. 5

   Optics

   3 topics

   • Ray Optics and Optical Instruments
     • Reflection and refraction at surfaces
     • Lenses and mirror formulae
     • Total internal reflection and prisms
     • Microscope and telescope
   • Wave Optics
     • Huygens' principle
     • Young's double-slit interference
     • Diffraction and polarisation
   • Dispersion and Scattering
     • Dispersion through a prism
     • Scattering of light and natural phenomena
6. 6

   Modern Physics and Electronics

   3 topics

   • Dual Nature of Radiation and Matter
     • Photoelectric effect
     • de Broglie wavelength
   • Atoms and Nuclei
     • Bohr model of hydrogen atom
     • Radioactivity and decay laws
     • Nuclear fission and fusion
   • Semiconductor Electronics
     • p-n junction diode and rectification
     • Transistors and amplifiers
     • Logic gates

Physics - Electromagnetism and Modern Physics flashcards for COMEDK UGET

18 of 61 cards from the Physics - Electromagnetism and Modern Physics deck — real questions with worked answers.

1. State Coulomb's law and write its formula for the force between two point charges in vacuum.

   The force between two point charges is directly proportional to the product of charges and inversely proportional to the square of the distance between them. F = (1/4πε₀)(q₁q₂/r²), where 1/4πε₀ ≈ 9 × 10⁹ N·m²/C².

2. What is the SI unit of electric charge and the value of the elementary charge e?

   The SI unit of charge is the coulomb (C). The elementary charge e = 1.6 × 10⁻¹⁹ C.

3. Define electric field intensity and give its formula due to a point charge.

   Electric field intensity is the force per unit positive test charge: E = F/q₀. Due to a point charge q at distance r: E = (1/4πε₀)(q/r²). SI unit: N/C or V/m.

4. State Gauss's law in electrostatics.

   The total electric flux through any closed surface equals 1/ε₀ times the net charge enclosed: Φ = ∮E·dA = q_enclosed/ε₀.

5. Using Gauss's law, give the electric field due to an infinite line charge and an infinite plane sheet of charge.

   Infinite line charge: E = λ/(2πε₀r). Infinite plane sheet: E = σ/(2ε₀), independent of distance from the sheet.

6. Define electric potential at a point and give its formula due to a point charge.

   Electric potential is the work done per unit positive charge in bringing it from infinity to that point. V = (1/4πε₀)(q/r). SI unit: volt (V) = J/C.

7. What is the relationship between electric field and electric potential?

   E = -dV/dr (the negative gradient of potential). The electric field points in the direction of decreasing potential.

8. Define capacitance and give the formula for a parallel plate capacitor.

   Capacitance C = Q/V, the charge stored per unit potential difference. For a parallel plate capacitor: C = ε₀A/d (with dielectric: C = Kε₀A/d). SI unit: farad (F).

9. Give the formulas for capacitors in series and in parallel.

   Series: 1/C = 1/C₁ + 1/C₂ + ... (equivalent capacitance is smaller). Parallel: C = C₁ + C₂ + ... (equivalent capacitance is larger).

10. What is the energy stored in a charged capacitor?

    U = ½CV² = ½QV = Q²/(2C), where C is capacitance, V the potential difference, and Q the charge.

11. Define electric dipole moment and give its direction.

    Electric dipole moment p = q × 2a, where 2a is the separation between charges +q and -q. It is a vector pointing from the negative charge to the positive charge. SI unit: C·m.

12. Give the electric field of a dipole on its axial and equatorial lines (for r >> a).

    Axial: E = (1/4πε₀)(2p/r³). Equatorial: E = (1/4πε₀)(p/r³). The axial field is twice the equatorial field and points along p; the equatorial field opposes p.

13. What is the torque on an electric dipole in a uniform electric field?

    τ = pE sinθ, or in vector form τ = p × E, where θ is the angle between the dipole moment and the field. Potential energy U = -pE cosθ = -p·E.

14. State Ohm's law and define resistance.

    Ohm's law: at constant temperature, V = IR; current through a conductor is proportional to the potential difference across it. Resistance R = V/I, SI unit ohm (Ω).

15. Give the formula for resistance in terms of resistivity, and how resistivity varies with temperature for metals.

    R = ρL/A, where ρ is resistivity, L length, A cross-sectional area. For metals, resistivity increases with temperature: ρ_T = ρ₀(1 + αΔT), where α is the temperature coefficient of resistance.

16. Define drift velocity and relate current to it.

    Drift velocity is the average velocity of electrons under an applied field: v_d = eEτ/m. Current I = nAev_d, where n is electron density, A area, e charge, v_d drift velocity.

17. Give the formulas for resistors in series and in parallel.

    Series: R = R₁ + R₂ + ... (total is larger). Parallel: 1/R = 1/R₁ + 1/R₂ + ... (total is smaller).

18. State Kirchhoff's two laws for electrical circuits.

    Junction (current) law: the sum of currents entering a junction equals the sum leaving (ΣI = 0), from charge conservation. Loop (voltage) law: the sum of EMFs and potential drops around a closed loop is zero (ΣV = 0), from energy conservation.

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