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Questions  

Calculate percentage error in determination a time period of a pendulum 
T=2πlg or 2πlg1/2 where, l and g are measured with ± 2% and ± 3% errors.

a
2.9%
b
± 2.5%
c
1.5%
d
± 1.9%

detailed solution

Correct option is B

ΔTT×100=±12×Δll×100+12×Δgg×100=±12×2+12×3=±2.5%

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