There is a horizontal film of soap solution. On it a thread is placed in the form of a loop. The film is pierced inside the loop and the thread becomes a circular loop of radius r. If the surface tension of the loop be t, then what will be the tension in the thread?
Answers
I’m sure there is some application of Kirchhoff's laws that can be used to solve this but I’ll just use basic resistance formulas for the solution. I am assuming the fourth resistor is connected in series with the other three. Each resistor is 8 ohms. The sum of 3 parallel resistances are (1/R1) + 1/(R2) + (1/R3) = 1/Rtotal. The three parallel resistances total resistance are 3 x(1/8) = 1/Rtotal. Solving for Rtotal you get 2.7 ohms. Connecting that in series with the 4th, 8 ohm resistor gives you a total resistance of 10.7 ohms, unless of course I am misinterpreting the problem.
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Pushpender Thakur
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