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A pendulum consisting of a small sphere ...

A pendulum consisting of a small sphere of mass m, suspended by a inextensible and massless string of length 1 , is made to swing in a verticle plane. If the breaking strength of the string is 2 mg, then the maximum angular amplitude of the displacement from the verticle can be

A

`0^@`

B

`30^@`

C

`60^@`

D

`90^@`

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The correct Answer is:
C
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