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![[Post New]](/templates/default/images/icon_minipost_new.gif) 14 Feb 2008 20:20:22 IST
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A soap bubble with a radius r is placed on another soap bubble of radius R. Angles between the films at the points of contact will be-
A] 120 degree
B] 30 degree
C] 45 degree
D] 90 degree
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"I a universe of atoms.......an atom in the universe" |
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15 Feb 2008 17:01:21 IST
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Please reply.....
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"I a universe of atoms.......an atom in the universe" |
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15 Feb 2008 20:32:56 IST
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i m not very sure but let me try.....
here bubbles are intersecting so i guess we can take into account that the cohesive force is stronger than adhesive force
when cohesive force is stronger than adhesive force the angle of contact is obtuse.......clearly in the options only 120 is obtuse
so (A) might bemight be correct option .............
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15 Feb 2008 21:16:43 IST
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i feel the ans is 90 degrees as the lins would be normals 2 the respective bubles and thus interesect at 90
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18 Feb 2008 22:33:13 IST
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anyone please give correct reasons......
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