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Length of a simple pendulum is 2 m and m...

Length of a simple pendulum is 2 m and mass of its bob is 0.2 kg. If the tension in the string exceeds 4 N , it will break . If `g = 10 m/s^2` and the bob is whirled in a horizontal plane, the maximum angle through which the sting can make with vertical during rotation is

A

`30^@`

B

`45^@`

C

`60^@`

D

`90^@`

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