Practice question

Given: A rod rotates at 15 rad/s in a 0.3 T field. If the length from the axis to the tip is 0.4 m, what is the emf induced? These values define the system as per NCERT data. Formula: varepsilon = 1/2 B omega R². This is the standard NCERT relation for this phenomenon. Substitution & Calculation: varepsilon = 1/2 × 0.3 × 15 × (0.4)² = 0.36 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.