Practice question

Given: A charge of 4 μC is moved from infinity to a point where the potential is 250 V . What is the work done? These values define the system as per NCERT data. Formula: Work done = Potential energy = q V. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: W = 4 × 10⁻⁶ × 250 = 10⁻³ J = 1 mJ . 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.