Three block A,B and C of equal to weights of mass 2 kg each are hanging on a string passing over a fixed pulley as shown in figure. What is the tension in the string connected between blocks B and C:
A) zero
B) \[13\,N\]
C) \[3.3\,N\]
D) \[19.6\,N\]
Correct Answer:
B
Solution :
From the figure, Free body diagrams of A, B and C \[a=\frac{40-20}{6}=\frac{10}{3}\] Also, \[20-T=2a\] \[\Rightarrow \] \[T=\frac{40}{3}=13.33\,\cong 13N\]