As shown in the figure, a chain of mass ...

As shown in the figure, a chain of mass m is placed on a smooth quarter circular portion of radius R. End A is tied with a wedge while the remaining chain is free, then the minimum work required to be done by the external agent to make the chain horizontal keeping point A fixed, is

`mgR`

`"mg "(2R)/(pi)`

`mgsqrt2(2R)/(pi)`

None

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