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AIIMS 201827 May

Exam: AIIMS
Year: 2018
Date: 27 May
Subject: Physics
Chapter: Mechanical Properties of Fluids

AIIMS 2018 · 27 May · Physics · Mechanical Properties of Fluids

A ring of radius R is kept on water surface. Surface tension of...

A ring of radius

R

is kept on water surface. Surface tension of water is

T

and mass is

m

. What force required to lift the ring from water surface?

Options

A $m g+\pi T R$
B $m g+\pi R$
C $m g+2 \pi T R$
D $m g+4 \pi T R$

Correct answer

D. $m g+4 \pi T R$

Step-by-step solution

Tequired force to lift the ring

F_{\text{ext }}=m g+2 \cdot T(2 \pi R) ;=m g+4 \pi T R

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