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3. A wire of length I and mass m is bent...

3. A wire of length I and mass m is bent in the form of a semicircle. The gravitational field intensity at the centre of semicircle is (a) (b) Gm along x-axis Gm alongy-axis 2Gm along y-axis (c) (d) 20Gm along x-axis 1 -

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