IB Physics SL D 2 2 Coulombs Law Questions

Practise IB Physics SL D.2.2 by applying Coulomb’s law to point charges, hydrogen atoms and resultant-force arrangements.

Exam points

State and apply F = kq₁q₂/r² for point charges.
Calculate electric-force magnitude and direction with consistent units.
Combine forces from several charges using superposition and symmetry.

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Study D.2.2—Coulomb’s law conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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This question is in two parts. Part 1 is about simple harmonic motion and forced oscillations. Part 2 is about electric and magnetic force fields.

Part 1 Simple harmonic motion and forced oscillations
The graph shows the variation with time of the displacement of an object undergoing simple harmonic motion.
displacement / mm

Figure for Question IB Physics SL D 2 2 Coulombs Law Questions question 1 — IB Physics SL

time / ms

Part 2 Electric and magnetic force fields

The diagram shows two isolated electrons, X and Y , initially at rest in a vacuum. The initial separation of the electrons is 5.0 mm . The electrons subsequently move apart in the directions shown.

Show that the initial electric force acting on each electron due to the other electron is approximately $9 \times 10^{-24} \mathrm{~N}$ .

(c) (i) use of $F=\frac{\left(1.60 \times 10^{-19}\right)^{2}}{4 \pi \varepsilon_{0}\left(5.0 \times 10^{-3}\right)^{2}}$ or $F=\frac{\left(1.60 \times 10^{-19}\right)^{2}}{\left(5.0 \times 10^{-3}\right)^{2}} \times 8.99 \times 10^{9}$ ;
$9.2 \times 10^{-24} \mathrm{~N} ;$

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IB Physics SL D 2 2 Coulombs Law Questions question 1