Many earphones are designed in the way pictured below. A coil of wire carrying an electric current is wrapped around a tiny speaker cone. The cone and coil are placed near a small magnet. Sound is generated by the speaker cone vibrating in different ways. The cone vibrates as different magnetic forces act on the current carrying coil. Why do the magnetic forces acting on the coil change as the current running through the coil changes?

For each of the following process: a) sketch the p-v diagram, b)sketch t-s diagram, c) sketch t-v diagram, d) sketch the boundary work on one of the diagrams (a, b or c) and e) sketch the reversible heat transfer on one of the diagrams (a, b or c): 1- isobaric process from compressed liquid to superheated vapor 2- isothermal process from compressed liquid to superheated vapor 3- isentropic process from compressed liquid to superheated vapor