The adjacent figure is the part of a horizontally stretched net. section AB is stretched with a force of 10 N . The tensions in the sections BC and BF are

Options

A. 10 N, 11 N
B. 10 N, 6 N
C. 10 N, 10 N
D. Can't calculate due to insufficient data

Answer

C

Explanation

From Lami.s theorem
`(T_(1))/(sin 120^(@)) = (T_(2))/(sin 120^(@)) = (T)/(sin 120^(@))`
`rArr T = T_(1) = T_(2)`
`rArr T = 10N`

Aliter :
` T_(1) sin 60^(@)= T_(2) sin 60^(@)`
`rArr T_(1) = T_(2)`
`2T_(1) cos 60^(@) = T= 10`
`rArr T_(1) = T = 10 N = T_(2)`