JEE Main 2020 (2 Sep, Shift 2) Physics Q7: Surface Tension

Question

A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 Nm

^{-1}

, density = 667 kg m

^{-3}

) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. sides of the capillary) make an angle of 60° with one another. Then h is close to (g = 10 ms

^{-2}

).

(1)0.172 m
(2)0.137 m
(3)0.087 mOfficial answer
(4)0.049 m

Official answer

Option 3

NTA final key (Sep 2020).

Accepted Answer

Option 3: 0.087 m

Answer

0.172 m

Answer

0.137 m

Answer

0.087 m

Answer

0.049 m

JEE Main 2 September 2020, Shift 2, Physics Q7

Same idea in other shifts