Question:
When a capillary tube of radius 'r' is immersed in water, rise of water is upto height 'h'. The mass of water in capillary tube is 'm'. When another capillary tube of radius 'xr' is immersed in water, the mass of water that will rise in this tube is
When a capillary tube of radius 'r' is immersed in water, rise of water is upto height 'h'. The mass of water in capillary tube is 'm'. When another capillary tube of radius 'xr' is immersed in water, the mass of water that will rise in this tube is
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A soap film has two free surfaces, so the force is 2 T times the length of the boundary.
Updated On: Oct 1, 2026
- \(x\cdot m\)
- \(\frac{m}{x}\)
- \(x^2m\)
- \((x+1)m\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
A soap film has two surfaces (inner and outer), and each pulls with a force \(T\) per unit length on the frame.
Step 2: Calculation:
The total boundary length of the square frame is \(4L\).
\[ F = 2T\times4L = 8TL \]
The values \(4TL\) would apply to a single surface, and 12 and 16 do not follow from any counting of surfaces here.
Final Answer:
The force on the film is \(8TL\), option (B). \[ \boxed{8TL} \]
A soap film has two surfaces (inner and outer), and each pulls with a force \(T\) per unit length on the frame.
Step 2: Calculation:
The total boundary length of the square frame is \(4L\).
\[ F = 2T\times4L = 8TL \]
The values \(4TL\) would apply to a single surface, and 12 and 16 do not follow from any counting of surfaces here.
Final Answer:
The force on the film is \(8TL\), option (B). \[ \boxed{8TL} \]
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