AB ભાગમાં બળ 10 N હોય,તો BC અને BF ભાગમાં

By drawing the free body diagram of point $B$

Let the tension in the section $BC$ and $BF$ are ${T_1}$ and ${T_2}$ respectively.
From Lami's theorem

$\frac{{{T_1}}}{{\sin 120^\circ }} = \frac{{{T_2}}}{{\sin 120^\circ }} = \frac{T}{{\sin 120^\circ }}$

$⇒$ $T = {T_1} = {T_2} = 10\;N.$