Q63 · Practice questionComplex familiar4 marks
QUESTION 63 (4 marks)
The graph shows gravitational field strength outside a spherical body. The body surface is at radius . If the field strength at is , determine the field strength at and explain the shape of the curve.
WORKED SOLUTION
4 marksPractice marking scheme
ANSWER
. The curve follows an inverse-square dependence.
Worked solution
Outside a spherical body,
Therefore
The curve falls steeply near the body and then flattens because .
States or uses inverse-square relationship.
Sets up radius ratio correctly.
Calculates correct field strength.
Explains non-linear decreasing curve.
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