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In a simple pendulum experiment for dete...

In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for 20 oscillation is measured by using a watch of 1 second least count. The mean value of time taken comes out to be 30 s. The length of pendulum is measured by using a meter scale of least count 1 mm and the value obtained is 55.0 cm. The percentage error in the determination of `g` is close to :

A

`0.2%`

B

`6.8%`

C

`3.5%`

D

`0.7%`

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The correct Answer is:
B
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