Exam-style question
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A satellite is in a circular orbit around Earth at a height of 2000 km above the surface. Calculate the orbital speed of the satellite. (Radius of Earth = 6400 km) Scenario focus: electric fields in a distinct A-Level Physics fields context; identify the field quantity, source, direction, and unit before selecting the answer.
- A.7.12 km/s
- B.5.57 km/s
- C.8.00 km/s
- D.6.25 km/s
Model answer
What a good answer should say
- 7.12 km/s
Explanation
Why this works
The correct answer is 7.12 km/s. This is correct for Gravitational fields because the stem is testing electric fields; 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.