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Q.

A thin wooden stick of length 5 cm is floating on water. Surface tension of water is 0.07 Nm-1. If a hot needle is placed on one side of the stick, surface tension decreased to 0.06 Nm-1. Now the net force on the stick is

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a

zero 

b

0.001 N 

c

0.0005 N

d

0.1 N
 

answer is D.

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Detailed Solution

F=T1−T2l=0.07−0.06×5×10−2N

=5×10−4N

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