1kg of a fluid is contained in a cylinder at an initial pressure of 20bar. The fluid is allowed to expand reversibly behind a piston according to the law c=pv² until the initial volume is doubled. The fluid is then cooled reversibly at a constant pressure until the piston regains its original position;heat is then supplied reversibly with the piston firmly locked in position until the pressure rises to the original value of 20bar. Calculate the net work done by the fluid for an initial volume of 0.05m³

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electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia