Various modified forms of Wave equation

This video lecture discusses the various different forms of the One Dimensional Wave Equation, when different forces act on the vibrating string, apart from the internal tension. This lecture should be watched in continuation with my video lecture on the One Dimensional Wave Equation. This is a part of the curriculum of Bachelor's in Mathematics at University of Delhi. The video has been made at home for the benefit of students whose academics are suffering due to covid 19.