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Q.

Three simple pendulums have lengths of strings 49 cms, 48 cms and 47 cms with diameters of the bobs 2 cms, 4 cm and 6 cm respectively. Then their periods are in the ratio

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a

1 : 1 : 1

b

1 : 2 : 3

c

3 : 2 : 1

d

51 : 52 : 53

answer is A.

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Detailed Solution

Tα√l where l is length of the pendulum from point of suspension to centre of the bobl=x+r
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