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# Which is not a necessary assumption for simple pendulumin-extensible, light and flexible string.heavy but small sized sphere (bob).angular displacement from the mean position is very less.volume of the bob is negligible.

A
in-extensible, light and flexible string.
B
heavy but small sized sphere (bob).
C
volume of the bob is negligible.
D
angular displacement from the mean position is very less.
Solution
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#### All the other three option are important assumption used in while deriving the time period of Simple Harmonic Motion.

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