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If the string is wound on the exterior ...

If the string is wound on the exterior four walls of a cube of side a cm starting at point C and ending at point D exactly above C , making equally spaced 4 turns . The side of the cube is :

A

`a = (2n)/(sqrt(255))`

B

`a = ((n)^(2))/(16)`

C

`a = (8a)/(sqrt(257))`

D

`a =2 sqrt (15)` n

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The correct Answer is:
C
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