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Q.

A U-tube has two vertical limbs of diameters 4mm and 5mm . When water is poured into it the water level difference between the limbs is ( T= 70 dyne cm−1 ) (g=10ms−2 )

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a

0.14 cm

b

0.014 cm

c

14 mm

d

0.14 mm

answer is A.

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Detailed Solution

Δn=2Tdg(1r−1R)=2×70×10-31000×1012×10-3−12.5×10-3=0.14cm
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