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A thin flat circular disc of radius 4.5 cm is placed gently over the surface of water. If surface tension of water is 0.07 N m−1 , then the excess force required to take it away from the surface is

Option 1 -

19.8 mN

Option 2 -

198 N

Option 3 -

1.98 mN

Option 4 -

99 N

0 2 Views | Posted a month ago
Asked by Shiksha User

  • 1 Answer

  • A

    Answered by

    alok kumar singh | Contributor-Level 10

    a month ago
    Correct Option - 1


    Detailed Solution:

    Excess force  = T × 2 π R

    = 7 1 0 0 × 2 × 3 . 1 4 × 4 . 5 1 0 0

    = 1 9 7 . 8 2 × 1 0 − 4

    =19.8×10−3 N

    =19.8mN

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