NEET 2019 Physics question

A mass 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 pointCorrect
(4)inclined at an angle of from vertical

Answer: (3)

Solution

At any point of the vertical circle the net force towards the centre gives , where is the angle of the wire from the downward vertical. At the lowest point , so . Here both terms are at their largest: (weight acts fully

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Question ID VK-092376