Exam-style question
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Calculate the change in gravitational potential energy when a 10 kg satellite is moved from a height of 2000 km to 3000 km above the Earth's surface. (Radius of Earth = 6400 km) Scenario focus: transformers in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
- A.9.81 x 10^5 J
- B.7.35 x 10^5 J
- C.1.47 x 10^6 J
- D.1.23 x 10^6 J
Model answer
What a good answer should say
- 7.35 x 10^5 J
Explanation
Why this works
The correct answer is 7.35 x 10^5 J. This is correct for Gravitational fields because the stem is testing transformers; 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.