A film of soap solution is trapped between a vertical frame and a light wire ab of length 0.1 m. If ` g = 10 m//s^2 ` , then the load mass that should be suspended from the wire to keep it in equilibrium is : ` (sigma = 25 xx 10 ^ (-3) N//m)`

Options

A. (a)0.25 gm
B. (b)`0.3` gm
C. (c)`0.4` gm
D. (d)`0.5 ` gm

Answer

D

Explanation

Force balancing, ` bar w = 2 sigma l , m xx 10 = 2 xx 25 xx 10 ^(-3) xx 0 .1 , m = 0 .5 g `