A is used to change the direction of force.

screw

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wedge

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pulley

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Solution

The correct option is C pulley
A pulley which has its axis of rotation unchanged, is called a fixed pulley.
Thus, in this arrangement there is no gain in the M.A. If the point of application of effort E moves a distance 'd' towards, the load 'L' moves the same distance upwards. A fixed pulley is used only to change the direction of effort to be applied, so the effort can be applied in a more convenient direction.

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