Electromagnetic Induction And Alternating Current — Flashcards

Answer

Given: A = 0.5 m², B = 2 T, θ = 0° (perpendicular means flux is maximum) Formula: Φ_B = BA cos θ Step 1: Identify the angle between B and normal to surface: θ = 0° Step 2: Apply the formula: Φ_B = 2…

Answer

Faraday's Law states: Whenever magnetic flux linked with a closed circuit changes, an emf is induced in the circuit. The magnitude of induced emf is equal to the negative time rate of change of magnet…

Answer

Lenz's law states that the direction of induced current is such that it always opposes the cause responsible for its production. Energy Conservation Principle: When a magnet approaches a coil, the in…

Answer

Given: l = 0.5 m, v = 4 m/s, B = 0.8 T, θ = 90° (perpendicular motion) Formula: ε = Blv sin θ (For perpendicular motion: sin 90° = 1) Step 1: Check that rod moves perpendicular to field: θ = 90° Ste…

Answer

Self-inductance (L) is the property of a conductor or coil to generate emf due to change in current flowing through itself. Definition: Self-inductance is the flux linkage produced per unit current: …

Answer

Given: N = 500 turns l = 0.4 m A = 0.01 m² μᵣ = 800 μ₀ = 4π × 10⁻⁷ H/m Formula: L = μ₀μᵣn²Al Where n = N/l = number of turns per unit length Step 1: Calculate turn density: n = N/l = 500/0.4 = 1250 …

Answer

Mutual Inductance (M) is the ability of one coil to induce emf in a neighboring coil through changing magnetic flux. Definition: Mutual inductance is the flux linkage in secondary coil per unit chang…

Answer

Given: M = 0.5 H i₁(initial) = 2 A i₁(final) = 8 A Δt = 0.1 s Formula: ε₂ = -M(di₁/dt) Step 1: Calculate rate of change of current: di₁/dt = (i₁(final) - i₁(initial)) / Δt di₁/dt = (8 - 2) / 0.1 = 6…