Verified Solution • 2025–26 Session moderate

QJEEM21Pha4b0: JEE Main 2021 Physics - Class 11 JEEM21Pha4b0 Solution: If the length of the pendulum in pendulum clock increases by…

If the length of the pendulum in pendulum clock increases by 0.1%, then the error in time per day is :

Multiple Choice Options

  • A 86.4 s
  • B 4.32 s
  • C 43.2 s
  • D 8.64 s

Step-by-Step Verified Solution

T=2πlgT = 2\pi \sqrt {{l \over g}}

ΔTT=12Δll{{\Delta T} \over T} = {1 \over 2}{{\Delta l} \over l}

ΔT=12×0.1100×24×3600\Delta T = {1 \over 2} \times {{0.1} \over {100}} \times 24 \times 3600

ΔT=43.2\Delta T = 43.2

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