question_answer

What points of the stretched string between the fixed points must be plucked and touched to excite its second harmonic?

Answer:

                In the second harmonic, there is a node at the centre and two antinodes at \[1/4\] and \[\text{3}/\text{4}\] points. To excite second harmonic, the wire should be plucked at its one-fourth length and touched at its centre.