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Find force underset('F')(rarr) at 'B' re...

Find force underset('F')(rarr) at 'B' required to keep the system in equilibrium. The dimension of the system are d=0.3m and a=0.2m. Assuming the rods to be massless

A

`150hat(i)`

B

`150(-hatk)`

C

`150(-hati)`

D

It cannot be in equilibrium

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Verified by Experts

The correct Answer is:
A
`hat(tau)_(c)=-dhat(i)xx100hat(j)+(-ahat(j))xx(+Fhat(i))=0`
`-100dhat(k)+aFhat(k)=0`
`implies 100d =aF implies F=(100xx0.3)/(0.2)=150`
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