Physics - Fluid Question with Solution | TestHub
On the surface of water we drop three pieces of thread which are linked to each other as shown in the figure. The threads do not sink but remain on the water surface. ( ) Now we drop a detergent at point A which decreases the surface tension in that region by a factor of 3.5 without changing the surface tension in other regions. In the next step, we drop the same detergent at point B . The coefficient of surface tension of water is . It changes surface tension in region B without changing it in other regions.\\
Choose the CORRECT statements :
Options:
Answer:
Solution:
Step 1 (detergent at A): tension in region A drops to T/3.5 and the threads rearrange - net force on becomes zero, so goes slack.
Step 2 (detergent at B): now the net force on vanishes, so goes slack while and are taut - (B)
