NEET Physics · Flashcards
This deck has 20 flashcards on Electrostatics for NEET Physics, from NCERT Class 12. It covers the NCERT chapters Electric Charges and Fields and Electrostatic Potential and Capacitance.
Master Electrostatics for NEET: High-yield conceptual flashcards covering Coulomb's Law, Gauss's Theorem, Electric Potential, and Capacitor networks with visual graphs.
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Card 1 of 20
State the Principle of Quantization of Charge.
Hint: You cannot have a fraction of an electron's charge (like 1.5e).
Answer
Electric charge is always an integral multiple of the basic quantum of charge (e). q = ±ne, where n = 1, 2, 3... and e ≈ 1.6 × 10⁻¹⁹ C.
Card 2 of 20
Write Coulomb's Law for the electrostatic force between two point charges and define Relative Permittivity (Dielectric Constant, K).
Hint: When placed in a medium of dielectric constant K, the force between charges decreases by a factor of K.
Answer
Answer Given Below:
Card 3 of 20
What are the two most important properties of Electric Field Lines?
Hint: If they intersected, there would be two different directions of the electric field at the same point, which is impossible.
Answer
1. They never cross (intersect) each other. 2. They do not form closed loops (electrostatic field is conservative).
Card 4 of 20
What is the direction of the Electric Dipole Moment (p) and its formula?
Hint: Unlike the electric field (which points + to -), the dipole moment points - to +.
Answer
Direction: From the NEGATIVE charge to the POSITIVE charge. Formula: p = q × 2a (where 2a is the separation between charges).
Card 5 of 20
What is the Torque (τ) experienced by an electric dipole in a uniform electric field?
Hint: Torque is maximum when θ = 90° and zero when θ = 0° or 180°.
Answer
τ = p × E Magnitude: τ = pE sin(θ), where θ is the angle between dipole moment (p) and electric field (E).
Card 6 of 20
Write the formula for the Potential Energy (U) of a dipole in a uniform electric field.
Hint: Stable equilibrium: θ = 0° (U is minimum, -pE). Unstable equilibrium: θ = 180° (U is maximum, +pE).
Answer
U = -p · E = -pE cos(θ)
Card 7 of 20
State Gauss's Law in Electrostatics.
Hint: Flux only depends on the ENCLOSED charge, not on the shape or size of the Gaussian surface.
Answer
The net electric flux (Φ) through any closed surface is equal to 1/ε₀ times the net charge enclosed by the surface. Φ = ∮ E · dA = qₑₙₗₒₛₑ/ ε₀
Card 8 of 20
What is the Electric Field (E) at a distance 'r' from an infinitely long straight uniformly charged wire?
Hint: E is inversely proportional to r (E ∝ 1/r).
Answer
E = λ / (2πε₀r) Where λ is the linear charge density (charge per unit length).
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