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Work, Energy, and Power — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsWork, Energy, and Power1 Mark
MCQ
Which of the following statements is true?
  • ✓
    The tension in the string is greater at points $III$ than at point $I$
  • B
    The tension in the string is greater at points $I$ than at point $III$
  • C
    The tension at point $I$ is equal to the tension at point $III$
  • D
    The tension in the string is greatest at point $II$
✓

Answer

Correct option: A.
The tension in the string is greater at points $III$ than at point $I$
When the bob is swinging in vertical circle the centripetal force and the pseudo force varies.
Centripetal force causes the tension in the string.
Let centripetal force be $C,$ pseudo force be $P$ and weight of bob be In.
At position $1, C = P − In$
At position $2, C = In$
At position $3, C = P + In$
As $C$ at position $3$ is greatest, the tension in the string is greatest at this position.

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