Verified Solution • 2025–26 Session moderate

QJEEM21Phf299: JEE Main 2021 Physics - Class 11 JEEM21Phf299 Solution: Time period of a simple pendulum is T inside a lift when the…

Time period of a simple pendulum is T inside a lift when the lift is stationary. If the lift moves upwards with an acceleration g/2, the time period of pendulum will be :

Multiple Choice Options

  • A 3T
  • B 23T
  • C T3
  • D 32T

Step-by-Step Verified Solution

When lift is stationary

T=2πLg

A pseudo force will act downwards when lift is moving upwards.

∴ geff=g+g2=3g2

∴ New time period

T′=2πLgeff

T′=2π2L3g

∴ T′=23T

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