JEE Advanced Mathematics question
Not in JEE syllabus
A circular ring of radius 3 cm is suspended horizontally from a point 4 cm vertically above the centre by 4 strings attached at equal intervals to its circumference. If the angle between two consecutive strings be then is
Answer: (C)
Solution
Let A be the point of suspension, B the centre of the ring, and C, D two consecutive attachment points. Each string has length
AC = AD = = = 5 cm.
Four equally spaced points are $90^\
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