Question
Question: A 10 cm long wire is brought 20 cm up in a liquid of surface tension 40 dyne cm<sup>–1</sup>. Find t...
A 10 cm long wire is brought 20 cm up in a liquid of surface tension 40 dyne cm–1. Find the work done against surface tension-
A
0.8 m J
B
1.6 m J
C
1.2 m J
D
3.2 m J
Answer
1.6 m J
Explanation
Solution
W = 2T (l.x) = 2 × 40 × 10–3 × .2 × .1 = 1.6 mJ