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String AB of unstretched length, L is st...

String AB of unstretched length, L is stretched by applying a force F at the mid-point C such that the segments AC and BC make an angle `theta` with AB as shown in the figure. The string may be considered as an elastic element with a force to elongation ratio K. The force F is given by
 

A

`KL(1-tan theta)sin theta`

B

`2KL(1-cos theta)tan theta`

C

`KL(1-costheta)tan theta`

D

`2KL(1-sin theta)tantheta`

Text Solution

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The correct Answer is:
C

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