Electricity and Magnetism

According to wien’s displacement law, the wavelength (λm) corresponding to maximum energy density is inversely proportional to the absolute temperature (T) of the body. This is called wien’s displacement law formula. Where b=0.2898 cm and b is called Wien’s constant. Derivation of Wien’s displacement law formula Wien’s displacement law derivation from Plank’s law According to … Read more

Transformer Definition For many purposes, it is necessary to change (or transform) an alternating voltage from one to another of greater or smaller value. This is done with a device called a transformer using the principle of mutual induction. A transformer is a static device that transfers alternating current from one circuit to another at an equal … Read more

Statement of Green’s theorem Green’s theorem is the extension of Stoke’s theorem and the divergence theorem. According to this theorem, if ϕ and ψ be the scalar functions, then Proof of Green’s theorem Let a vector According to the divergence theorem. Substituting the value of eqn. (2) in eqn. (1) we get Which is the … Read more

Ampere’s circuital law has many applications in calculating magnetic field at any point due to current-carrying wire, current-carrying solenoid, and toroid. Application of ampere’s circuital law Ampere Circuital Law has basically 3 major applications: Magnetic field due to a current carrying long wire Magnetic field at a point outside the wire A current carrying long … Read more

Stokes Theorem Statement According to this theorem, the line integral of a vector field A vector around any closed curve is equal to the surface integral of the curl of A vector taken over any surface S of which the curve is a bounding edge. Stokes Theorem Proof Let A vector be the vector field … Read more