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IB Physics HL D.2.13 Electric potential as scalar Question Bank

Practise IB Physics HL D.2.13 by applying electric potential as scalar concepts to exam-style physics questions.

Syllabus
First assessment 2025
Course
Physics HL
Level
HL

Exam points

  • identify the relevant physical quantity, model or diagram
  • apply the correct equation and units to the evidence
  • justify the result using conservation laws, fields or energy relationships

D.2.13 (HL)—Electric potential as scalar question 1

[Maximum number: 2]

A vertical wall carries a uniform positive charge on its surface. This produces a uniform horizontal electric field perpendicular to the wall. A small, positively-charged ball is suspended in equilibrium from the vertical wall by a thread of negligible mass.

Figure for Question D.2.13 (HL)—Electric potential as scalar question 1 — IB Physics HL

The centre of the ball, still carrying a charge of 1.2×10−6C1.2 \times 10^{-6} \mathrm{C}, is now placed 0.40 m from a point charge Q . The charge on the ball acts as a point charge at the centre of the ball.
P is the point on the line joining the charges where the electric field strength is zero. The distance PQ is 0.22 m .

Figure for Question D.2.13 (HL)—Electric potential as scalar question 1 — IB Physics HL

Outline, without calculation, whether or not the electric potential at P is zero.

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