Exam-style question
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A satellite orbits Earth at a height of 3000 km. Calculate the gravitational field strength at this height. (Radius of Earth = 6400 km) Scenario focus: potential gradients in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
- A.8.69 N/kg
- B.9.81 N/kg
- C.7.33 N/kg
- D.6.67 N/kg
Model answer
What a good answer should say
- 8.69 N/kg
Explanation
Why this works
The correct answer is 8.69 N/kg. This is correct for Gravitational fields because the stem is testing potential gradients; the chosen option keeps the field quantity, source interaction, direction, and unit consistent.
The alternatives are weaker because they mix gravitational, electric, magnetic, orbital, or transformer ideas, or they attach the right number to the wrong physical meaning.
Common mistake
No common mistake is linked to this question yet.