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WB JEE 2020
MCQ (More than One Correct Answer)
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A simple pendulum of length l is displaced, so that its taught string is horizontal and then released. A uniform bar pivoted at one end is simultaneously released from its horizontal position. If their motions are synchronous, what is the length of the bar?
A
$${{3l} \over 2}$$
B
l
C
2l
D
$${{2l} \over 3}$$
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