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Question

Physics Question on Surface tension

Two soap bubbles of radii a and b combine to form a single bubble of radius 3) If P is the external pressure, then S.T. of the soap solutionis

A

P(c3+a3+b3)4(a2+b2+c2)\frac{P(c^3 +a^3+b^3)}{4(a^2+b^2+c^2)}

B

P(c3−a3−b3)4(a2+b2−c2)\frac{P(c^3 -a^3-b^3)}{4(a^2+b^2-c^2)}

C

Pc3−4a2−4b2Pc^3-4a^2-4b^2

D

Pc3−2a2−3b2Pc^3-2a^2-3b^2

Answer

P(c3−a3−b3)4(a2+b2−c2)\frac{P(c^3 -a^3-b^3)}{4(a^2+b^2-c^2)}

Explanation

Solution

P(c3−a3−b3)=4T(a2+b2−c2)P ( c^3 - a^3 - b^3) = 4T (a^2 + b^2 - c^2)