A second harmonic has to be generated in a string of length $l$ stretched between two rigid supports. The points where the string has to be plucked and touched are respectively
  • A$\frac{l}{4}, \frac{l}{2}$
  • B$\frac{l}{4}, \frac{3l}{4}$
  • C$\frac{l}{2}, \frac{l}{2}$
  • D$\frac{l}{2}, \frac{3l}{4}$
Easy
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