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Q.

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 lengthHence plucking distance from one end =l2p=l2×2=l4.
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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