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Q.

A uniform chain of mass m and length l hangs from a hook in ceiling as shown in fig I. The bottom of link is now raised vertically with the help of upward external force F(y) very slowly as shown in fig. II. Choose CORRECT option(s)

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a

F(y)=mgy2l

b

Work done by F(y) in raising end B to the position of end A is mgl4

c

F(y)=mgy4l

d

Work done by F(y) in raising end B to the position of end A is mgl8

answer is B, C.

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