A thin wire of length L and mass M is bent to form a semicircle. What is the gravitational field at the centre?

Options

(a) πGM/L² along the line joining the ends
(b) πGM/L² perpendicular to the above line
(c) 2πGM/L² along the line joining the ends
(d) 2πGM/L² perpendicular to the above line

Correct Answer:

2πGM/L² perpendicular to the above line

Explanation:

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