Practice question

Given: A rod rotates at 25 rad/s in a 0.3 T field. If the length from the axis to the tip is 0.8 m, what is the emf induced? These values define the system as per NCERT data. Formula: varepsilon = 1/2 B omega R². This is standard NCERT relation. Substitution & Calculation: varepsilon = 1/2 × 0.3 × 25 × (0.8)² = 2.4 V . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.