AP EAMCET Engineering 2018 Apr 24 Shift 1 Paper

Section: Physics

Question : 94 of 160

Marks: +1, -0

When a soap bubble of radius 0.2 mm is charged, it experiences an outward electrostatic pressure of magnitude

σ2

2∊0

where σ = 20 µCm−2 is the surface charge density. If the excess pressure inside the soap bubble due to the surface tension is same as this electrostatic pressure, then the surface tension of the soap solution is
(∊0 = 8.85 × 10−12C2N−1m−2)

8.85 × 10−4Nm−1
12.4 × 10−4Nm−1
11.3 × 10−4Nm−1
90 × 10−4Nm−1

Validate

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