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An insect crawls a rough hemispherical s...

An insect crawls a rough hemispherical surface. The coefficient of friction between it and surface is `1//3`. If the line joining the insect and the centre of surfaces makes an angle a with the vertical, the maximum possible value of a is :

A

`cot alpha = 3`

B

`tan alpha=3`

C

`sec alpha = 3`

D

`cosec. alpha = 3`.

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The correct Answer is:
A
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