Question

The given figure shows an arrangement of moving pulleys.

If the effort applied at the free end of the string is E; what is the mechanical advantage of the system of pulleys?

• A. 2
• B. 4
• C. 6
• D. 8

Answer 1

The correct option is B

4

Arrow sign $(\uparrow )$ in the figure shows the direction of the force exerted by four strings and magnitude is equal to T.

In equilibrium, L = 4T and E = T.
$\therefore$ Mechanical advantage $=\frac{4T}{T}=4$