Three equal weights of mass 2 kg each are hanging on a string passing over a fixed pulley as shown in fig What is the tension in the string connecting weights B and C?

Options

A. zero
B. 13 N
C. `3.3 N`
D. `19.6 N`

Answer

B

Explanation

`a=((m_(1)-m_(2))/(m_(1)+m_(2)))g=((2m-m)/(2m+m))g=g/3`
As mass C is coming downward,
`:. T=m(g-a)=2(g-g/3)=4/3xx10~=13N`