Three equal weight `A,B` and `C` of mass `2kg` each are hanging on a string passing over a fixed frictionless pulley as shown in the figure. The tension in the string connecting weights `B` and `C` is approximately

Options

A. `(a)zero`
B. `(b)13 N`
C. `(c)3.3 N`
D. `(d)19.6 N`

Answer

B

Explanation

`a = ("Net pulling force")/("Total mass")`
`= ((2 + 2 - 2) g)/(2 + 2 + 2) = (g)/(3)`
FBD of `C`
`mg - T = ma = (mg)/(3)`
:. `T = (2)/(3) mg`
`= (2)/(3) (20) = 13.3N`