State the kind of lever which always has the mechanical advantage less than $1$ .

C l a s s I

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C l a s s I I

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C l a s s I I I

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None of the above

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Solution

The correct option is C $C l a s s I I I$
Mechanical advantage $= \frac{L o a d}{E f f o r t}$ = $\frac{E f f o r t a r m}{L o a d a r m}$ .

Mechanical advantage is directly proportional to the length of the effort arm. $C l a s s I I I$ levers have mechanical advantage less than $1$ because effort arm is always smaller than the load arm.

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