Question

Mechanical advantage is equal to

• A. $2\pi R\times 2\pi r$
• B. $2\pi R-2\pi r$
• C. $\frac{2\pi R}{2\pi r}$
• D. None of these

Answer 1

The correct option is C $\frac{2\pi R}{2\pi r}$

solution :
mechanical advantage = $\frac{distance-moved-by-the-effort}{distance-moved-by-the-load}$

hence, the ratio of lengths i.e. $\frac{R}{r}$

hence , the correct opt: C