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A vector of length l is turned through t...

A vector of length `l` is turned through the angle `theta` about its tail. What is the change in the position vector of its head ?

A

`l cos (theta//2)`

B

`2 l sin (theta//2)`

C

`2l cos (theta//2)`

D

`l sin (theta//2)`

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The correct Answer is:
B
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