A hydraulic jack is based on:

Pascal’s principle

Explanation

According to Pascal’s principle, when pressure is applied to a confined fluid it is transmitted undiminished in all directions. This is used to magnify force in a hydraulic jack. A pressure is applied to a narrow cylinder to lift a load placed on a wide cylinder. Since the pressure is transmitted unchanged, and \(\text { force }=\text { pressure } \times \text { area }\) , the force on the wide cylinder is larger than the force applied to the narrow cylinder.

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