Question

A mosquito with $8$ legs stands on water surface each leg makes depression of radius ${}^{\prime }{a}^{\prime }$ . If the surface tension and angle of contact are${}^{\prime }{T}^{\prime }$ and zero respectively, then the weight of mosquito is :

• A. $8T.a$
• B. $16\pi Ta$
• C. $\frac{Ta}{8}$
• D. $\frac{Ta}{16\pi }$

Answer 1

Answer: (A)

$8T.a$

A mosquito of $8$ legs stands on a water surface makes depression of radius$a$. Since angle between surface tension and contact is zero. So weight of the mosquito

$W=8Ta$