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A bob is attached to two strings of leng...

A bob is attached to two strings of length 3m and 4 m as shown. The distance AB between points of suspension is 5n. Bob oscillates with time period `(2pi)/5sqrt(5)` sec. in such a manner that bob moves perpendicular to plane of drawing. Fill n in OMR sheet.

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The correct Answer is:
6

`T=2sqrt((l_(eff))/g) =2pisqrt(12/50) =(2pi)/5 sqrt(6) sec`
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