Electric Potential & Potential Energy — A/L Physics

How do I practise Electric Potential & Potential Energy?

1 question with a worked solution

1. What is the work done by an external agent in moving a point charge q = +2.0 μC from a point A at electric potential V_A = +50 V to a point B at electric potential V_B = +150 V at constant velocity?
   1. A) +4.0 × 10⁻⁴ J
   2. B) +1.0 × 10⁻⁴ J
   3. C) -2.0 × 10⁻⁴ J
   4. D) +2.0 × 10⁻⁴ J
   Check my answer

   Correct answer: D) +2.0 × 10⁻⁴ J

   Work done by an external agent in moving a charge q between two points is W = q ΔV = q (V_B - V_A). Substituting: W = (2.0 × 10⁻⁶ C) × (150 V - 50 V) = 2.0 × 10⁻⁶ C × 100 V = +2.0 × 10⁻⁴ J.

   Show worked solution

   Step 1: Formula: W = q (V_final - V_initial). Step 2: W = 2.0 × 10⁻⁶ C × (150 V - 50 V) = 2.0 × 10⁻⁴ J. Answer: +2.0 × 10⁻⁴ J.
   Modelled on: the A/L Physics examination pattern

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Next in the syllabus

Where does Electric Potential & Potential Energy fit in the syllabus?

Unit 6.3 · Year 1 · Term 3