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A disc arranged in a vertical plane has ...

A disc arranged in a vertical plane has two groves of same length directed along the vertical chord AB and CD as shown in the fig. The same particles slide down along AB and CD. The ratio of the time `t_(AB)//t_(CD)` is

A

`1:2`

B

`1 : sqrt(2)`

C

`2 : 1`

D

`sqrt(2) : 1`

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The correct Answer is:
B
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