Derive an expression for self inductance

Derive an expression for decay constant.

Derive an expression for rms value of ac.

Derive an expression for Acceleration due to gravity.

Derive an expression for pressure in side liquid of depth h.

Derive an expression for potential due to a dipole at any point.

Derive an expression for the magnetic induction at a nearby point of a straight and long current-carrying conductor. Discuss the nature of the magnetic lines of induction.