A loop of $6.28 c m$ long thread is put gently on a soap film in a wire loop. The film is pricked with a needle inside the soap film enclosed by the thread. If the surface tension of soap solution is $0.030 N / m$ , then the tension in the thread is

1 \times 10^{- 4} N

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2 \times 10^{- 4} N

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3 \times 10^{- 4} N

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4 \times 10^{- 4} N

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Solution

The correct option is C $3 \times 10^{- 4} N$
For a flat film, the Force to Surface Tension relation is $F = T \times r$
$6.28 = 2 π r$
Hence $r = 1 c m = .01 m$
Tension = 0.030 $\times$ 0.01 N
= $3 \times 10^{- 4} N$

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Q. A loop of 6.28 cm long thread is put gently on a soap film in a wire loop. The film is pricked with a needle inside the soap film enclosed by the thread. If the surface tension of soap solution is 0.030 N/m, then the tension in the thread is

Q. A loop of 6.28 cm long thread is put gently on a soap film it a wire loop. The film is pricked with a needle inside the soap film enclosed by the thread. If the surface tension of soap solution is 0.030 N/m, then the tension in the thread is:

Q. A wire forming a loop is dipped into soap solution and taken out, so that a film of soap solution is formed. A loop of

6.28 e m

long thread is gently put on the film and the film is pricked with a needle inside the loop. The thread loop takes tile shape of a circle. Find the tension in the thread. Surface tension of soap solution

= 0.030 N / m

Q. A wire forming a loop is dipped into soap solution and taken out so that a film of soap solution is formed. A loop of 6.28 cm long thread is gently put on the film and the film is pricked with a needle inside the loop. The thread loop takes the shape of a circle. Find the tension the the thread. Surface tension of soap solution = 0.030 N m⁻¹.

A wire forming a loop is dipped into soap solution and taken out so that a film of soap solution is formed. A loop of 6.28 cm long thread is gently put on the film is pricked with a needle inside the loop. The thread loop takes the shape of a circle. Find the tension in the thread. Surface tension of soap solution = $0.030 N m^{- 1}$ .

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A loop of 6.28cm long thread is put gently on a soap film in a wire loop. The film is pricked with a needle inside the soap film enclosed by the thread. If the surface tension of soap solution is 0.030N/m, then the tension in the thread is

The correct option is C 3×10−4NFor a flat film, the Force to Surface Tension relation is F=T×r6.28=2πr Hence r=1cm=.01mTension = 0.030 × 0.01 N= 3×10−4N

A loop of $6.28 c m$ long thread is put gently on a soap film in a wire loop. The film is pricked with a needle inside the soap film enclosed by the thread. If the surface tension of soap solution is $0.030 N / m$ , then the tension in the thread is

The correct option is C $3 \times 10^{- 4} N$
For a flat film, the Force to Surface Tension relation is $F = T \times r$
$6.28 = 2 π r$
Hence $r = 1 c m = .01 m$
Tension = 0.030 $\times$ 0.01 N
= $3 \times 10^{- 4} N$