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 Sep 18, 2022
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lf $T$ is to be reduced to $\frac{T}{3}$ then the length of pendulum should be
Difficulty: Easy
A: 
$\frac{l}{2}$
B: 
$\frac{l}{3}$
C: 
$\frac{l}{4}$
D: 
$\frac{l}{9}$
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NETNUST Entry TestPhysicsOscillations