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Electrodynamics – It deals with electric and magnetic phenomena associated with charged and magnetic bodies . Examples , o motion of a current-carrying conductor in a magnetic field o the response of a circuit to an ac voltage ( signal ) o the propagation of radio waves in the ionosphere
o Optics – It deals with phenomena involving light . Examples , o Reflection and refraction of light o Dispersion of light through a prism o Colour exhibited by thin films o
Thermodynamics – It deals with systems in macroscopic equilibrium and changes in internal energy , temperature , entropy etc . of systems under application of external force or heat . Examples , o Efficiency of heat engines o Direction of physical and chemical process