Question

A liquid film is formed over a ring of area `0.02 xx 10^(4) cm^(2)` . The surace energy is
(Given surface tension of liquid = 0.5 N/m)
A. `0.03` J
B. `0.01`J
C. `0.02`J
D. `0.002` J

Answer 1

Correct Answer - C
Surface energy ` = T xx2A`
` = 0.5 xx 2xx0.02`
= 0.02 J