Gravitational Field
Field strength at distance r from point mass M?
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About This Question
- Subject
- physics
- Chapter
- gravitation
- Topic
- gravitational field
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
G M / r²
- Definition: The gravitational field strength (g) at a point is the gravitational force experienced by a unit test mass placed at that point.
- Formula: g=mtestF.
- Application: For a test mass m at distance r from source mass M:
- F=r2GMm
- g=mGMm/r2=r2GM
- Result: The field strength is GM/r2, directed toward the source mass.
This easy difficulty physics question is from the chapter gravitation, covering the topic of gravitational field. It appeared in the 2025 exam.
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