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Question

In case of measurement of 'g', if error in measurement of length of pendulum is 2%, the percentage error in time period is 1%. The maximum error in measurement of g is
  1. 1%
  2. 2%
  3. 4%
  4. No error


Solution

The correct option is C 4%
T=2πlg
g=4π2lT2

Total % error =1×2% +2×1%=4%

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