Practice question

Given: A transformer has N_p = 800, N_s = 400 . If V_s = 110 V (rms), what is the primary voltage? These values define the system as per NCERT data. Formula: V_s/V_p = N_s/N_p. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: V_p = V_s × N_p/N_s = 110 × 800/400 = 220 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.