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A chain has mass m and contains n identical links, where n is an odd integer. The chain is hanging vertically from the roof. If g is the acceleration due to gravity, the force exerted by the middle link on the one that is below it is

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a

(n+1)mg2n

b

(n-1)mgn

c

(n+1)mgn

d

(n-1)mg2n

answer is D.

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Detailed Solution

.  (n+1)2 will be the middle one (n-12) will be below the middle weight of each link is mgn weight of n-12 link will be the force given by the middle one next to it and will get the same reaction force
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