ANGLE OF CONTACT

JEE Main 2015 Guidance › Mechanics questions › ANGLE OF CONTACT

For CONCAVE minuscus adhesive force>cohesive
For CONVX minuscus adhesive< cohesive
For plane (neither concave nor convx angle of contact =90Â°) :

a) adhesive<cohesive

b) adhesive>cohesive

c) adhesive=cohesive
??????

#Physics #Mechanics

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8 Answers

11

SANDIPAN CHAKRABORTY ·2010-04-08 07:11:19

is it c ??

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1

TANAY ·2010-04-08 08:18:05

yaar my techer told me its a

bt in books c is givn

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1

kamalendu ghosh ·2010-04-08 08:19:52

its c i s'pose

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1

Manmay kumar Mohanty ·2010-04-08 08:25:05

for concave angle of contact is less than 90Â°and for convex angle of contact is greater than 90Â°.
for a 90Â° angle of contact adhesive force must be equal to cohesive to cancel out each others effect, since midway of obtuse and acute is 90 hence midway of adhesive > cohesive and cohesive > adhesive must be adhesive = cohesive which correspomds to 90Â° angle
so i thnk the answer shuld be (c)..

DID UR TEACHER GIVE ANY EXPLANATION FOR HIS ANSWER.[7]

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1

TANAY ·2010-04-08 08:38:48

if liq nt rising or fallng

Fa=Fc''(component of Fc)

therefore Fc >Fa

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29

govind ·2010-04-09 07:40:49

maybe this will help

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TANAY ·2010-04-09 07:44:54

thnx

cohesive >adhesive it means

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29

govind ·2010-04-09 07:47:06

Ya final conclusion
Cohesive > Adhesive

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