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A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

(1) the mass is at the highest point

(2) the wire is horizontal

(3) the mass is at the lowest point

(4) inclined at an angle of 60° from vertical
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Ans : (3) the mass is at the lowest point

Explanation :

We know that,

T– mg = mu2/l

⇒ T = mg + mu2/l

The tension is maximum at the lowest position of mass, so the chance of breaking is maximum.

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