How many NESA Physics questions cover Problem Solving?

AusGrader has 12 NESA Physics questions on Problem Solving, all with instant AI grading and detailed marking feedback.

NESA (HSC) Physics — Problem Solving Questions & Answers | AusGrader

An electron is situated halfway between two nuclei that are separated from each other by a distance of $4.5 \times 10^{-10}$ m. The first nucleus contains two protons. The second nucleus contains three protons.

Calculate the magnitude of the overall electromagnetic force experienced by the electron. (N to 1 decimal place)

$F_2 = \dfrac{1}{4\pi\varepsilon_o}\dfrac{Q_1\times q_e}{r_1^2}$

$= 9\times 10^9\times \dfrac{3(1.6\times 10^{-19})\times 1.6\times 10^{-19}}{(2.25\times 10^{-10})^2}$

$= 1.3\times 10^{-8}\ \text{N}$

$F_1 = \dfrac{1}{4\pi\varepsilon_o}\dfrac{Q_2\times q_e}{r_2^2}$

$= 9\times 10^9\times \dfrac{2(1.6\times 10^{-19})\times 1.6\times 10^{-19}}{(2.25\times 10^{-10})^2}$

$= 9.0\times 10^{-9}\ \text{N}$

$|F_{net}| = |F_1| - |F_2|$

$= 1.4\times 10^{-8} - 9.1\times 10^{-9}$

Force = $4.0\times 10^{-9}\ \text{N}$ (to 1 decimal place)

Marking Criteria

Descriptor	Marks
Indicates an understanding of the physical scenario in relation to Coulomb’s law.	1
Provides pertinent mathematical operation/s correctly performed.	1
Determines the forces (or electric field strength) imposed by each nuclei on the electron.	1
Determines the correct net force.	1

NESA Physics Problem Solving

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