Blocks A ard B in the figure are connected by a bar of negligible weight. Mass of each block is 170 kg and ${\mathrm{\mu }}_{\mathrm{A}} = 0.2 \mathrm{and} {\mathrm{\mu }}_{\mathrm{B}} = 0.4$,  where ${\mathrm{\mu }}_{\mathrm{A}} \mathrm{and} {\mathrm{\mu }}_{\mathrm{B}}$ are the coefficients of limiting friction between blocks and plane, calculate the force developed in the bar (g = 10 $\mathrm{m}/{\sec }^2$):

• A

  150 N

• B

  75 N

• C

  200 N

• D

  250 N