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Q.

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.

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a

2.9%

b

± 2.5%

c

1.5%

d

± 1.9%

answer is B.

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Detailed Solution

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