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Question

Where is the centre of gravity of a uniform ring situated ?

A
At the centre of ring.
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B
At the centre of semicircular ring
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C
At the centre of radius
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D
cant say
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Solution

The correct option is A At the centre of ring.
Centre of gravity means a point from which the weight of a body or system may be considered to act. In uniform gravity it is the same as the centre of mass.For regular bodies centre of gravity lies at the centre of the body.Hence we know that there will be a centre for a uniform ring lamina.Hence this centre of the ring will be centre of gravity.

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