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
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a
Plucked at l4 and touch at l2
b
plucked at l4 and touch at 3l4
c
plucked at l2 and touched at l4
d
Plucked at l2 and touched at 3l4
answer is A.
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Detailed Solution
Second harmonic means 2 loops in a total length. Hence plucking distance from one end = l2p = l2×2 = l4