A second harmonic has to be generated in a string of length l stretched between two rigid supports. The point where the string has to be plucked and touched are

Options

A. pluck at `L/2 " and touch at " (3L)/4`
B. pluck at `L/4 " and touch at " L/2`
C. pluck at `L/3 " and touch at " L/2`
D. pluck at `L/4 " and touch at " L/3`

Answer

B

Explanation

For second harmonic , there should be two loops. For this touch at ` L/2 ` and pluck at ` L/ 4` .