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Question

When a capillary tube of radius 0.2 mm is dipped vertically in water of surface tension 0.072 Nm1 and of angle of contact is 0o , the weight of water supported by surface tension in the capillary tube is _____ N.

A
90.5×106
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B
90.5×106
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C
90.5×105
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D
90.5×105
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Solution

The correct option is D 90.5×106
Force due to surface tension
F=T×2πrcosθ , θ= 0
So the weight of water supported is F
F=90.4×106N

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