Teaching UP B.Ed (Paper 1 & 2) Mock Test 2025 Physics Fluids Surface tension

त्रिज्या r के साबुन के बुलबुले में अतिरिक्त दबाव किसके आनुपातिक है?

1
1/r
2
\(\frac{1}{r^2}\)
3
r
4
r2
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