Practice question

Given: A wheel with 6 spokes of 0.3 m each rotates at 40 rpm in a 0.6 T field. What is the induced emf? These values define the system as per NCERT data. Formula: omega = 2π × 40/60 = 4π/3 rad/s. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: varepsilon = 1/2 B omega R² = 1/2 × 0.6 × 4π/3 × (0.3)² = 0.07536 V approx 0.075 V . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.