Question
Question: The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m<sup>2</sup>, it...
The surface tension of liquid is 0.5 N/m. If a film is held on a ring of area 0.02 m2, its surface energy is
A
5 × 10-2 joule
B
2.0 × 10-2 joule
C
4 × 10-4 joule
D
0.8 × 10-1 joule
Answer
2.0 × 10-2 joule
Explanation
Solution
Surface energy =T×ΔA=0.5×2×(0.02)
= 