Physics-
General
Easy

Question

A light open rigid wire frame floats on the surface of water as shown in fig. What force will act on the frame due to surface, immediately after some soap solution is dropped inside it . T subscript 1 end subscript and T subscript 2 end subscript are the surface tensions of water and soap solutions respectively open parentheses T subscript 1 end subscript greater than T subscript 2 end subscript close parentheses.

  1. Zero    
  2. open parentheses T subscript 1 end subscript minus T subscript 2 end subscript close parentheses l    
  3. open parentheses T subscript 1 end subscript plus T subscript 2 end subscript close parentheses left parenthesis 2 a plus 2 b minus l right parenthesis    
  4. open parentheses T subscript 1 end subscript minus T subscript 2 end subscript close parentheses left parenthesis 4 a plus 2 b minus l right parenthesis    

The correct answer is: open parentheses T subscript 1 end subscript minus T subscript 2 end subscript close parentheses l

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