Practice question

Given: A wheel with 10 spokes of 0.7 m each rotates at 60 rpm in a 0.5 T field. What is the induced emf? These values define the system as per NCERT data. Formula: omega = 2π × 60/60 = 2π rad/s. This is standard NCERT relation. Substitution & Calculation: varepsilon = 1/2 B omega R² = 1/2 × 0.5 × 2π × (0.7)² = 0.7697 V approx 0.77 V . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.