Practice question

Given: A rod of length 0.2 m moves at 5 m/s in a 0.3 T field perpendicular to its length. What is the induced emf? These values define the system as per NCERT data. Formula: Motional emf: varepsilon = B l v. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: varepsilon = 0.3 × 0.2 × 5 = 0.3 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.