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A sphere of mass 4 kg is attached to one...

A sphere of mass 4 kg is attached to one end of a steel wire of length 1 m and radius 1 mm. It is whirled in a vertical circle with an angular velocity 10rad `s^(-1)`. If the sphere is at the lowest point of its path, the elongation in the wire is ______

A

0.2 mm

B

0.3 mm

C

0.7 mm

D

0.4 mm

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