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Q.

A block of 3 kg is attached to a string whose other end is attached to the wall. An unknown force F is applied so that the string makes an angle of 30º with the wall. The tension T is: (Given g = 10 ms-2)
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a

20N

b

10N

c

15N

d

25N

answer is B.

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Detailed Solution

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Using Lami’s Theorem
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3gsin⁡120∘=Tsin⁡90∘⇒T=3g3/2=20

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