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The U-tabe with limbs of diameters 5 mm ...

The U-tabe with limbs of diameters 5 mm and 2 mm contains water of surface tension `7 xx 10^(-2)Nm^(-1)`. The angle of contact is zero and density `10^(3)kg m^(-3)`. If g is `10ms^(-2)` then, the difference in levela in the twa limbs is

A

`8.4` cm

B

`8.4` mm

C

`8.4` m

D

`0.84` mm

Text Solution

Verified by Experts

The correct Answer is:
B
`h_(2)-h_(1)=(2Tcos theta )/2 (1/(r^(2))-1/(r_(1)))`
` = (2 xx 7xx 10^(-2) xx1)/(10^(3) xx 10xx 10^(-3)) (1/1-1/25)= 8.4mm`
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