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 use Coulomb’s law for the force between point charges.
Apply the inverse-square dependence to compare electrostatic forces as separation changes.
Calculate electrostatic force magnitude between charged particles using charge and separation.
Use superposition and Coulomb’s law to determine resultant force or charge relationships.

[Maximum number: 2]

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