Q. A beaker of radius 15 cm is filled with a liquid of surface tension $0.75\ {Nm}^{- 1}$ . Force across an imaginary diameter on the surface of the liquid is
A) 0.075 N
B) $1.5 \times 10^{- 2}\ N$
C) 0.225 N
D) $2.25 \times 10^{- 2}\ N$
Explanation
(d) $Given\ that\ surface\ tension = 0.075{N\ m}^{- 1};$
$diameter = 30\ cm = 0.30\ m$
$\therefore Force = 0.075 \times 0.30$
$\ \ = 0.0225\ N = 2.25 \times 10^{- 2}\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.