1.

Surface tension of liquid is 5N/m. If a thin flm of area 0.02 m2 is made in a ring then the surface energy wllbe(A) 16x 103 J(B) 2.5 10-3 J(C) 1 x 10-1 J(D) 5 x 10-J

Answer»

W=T×ΔA=5×2×(0.02)

(Film has two free surfaces)

=2×10−1J

The answer to option C is 2×10^-1 J . The option provided is wrong.



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