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An insect crawls up a hemisherical surfa...

An insect crawls up a hemisherical surface very sloely .The coefficient of friction between the insert and the surface is `1//3` If the line joining the center of the hemisherical surface of the insert makes on angle a with the verticle , the maximum possible value of a is given by

A

`cot alpha =3`

B

` sec alpha = 3`

C

`cosec alpha =3`

D

None

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The correct Answer is:
A
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