I2

A small drop of oil stands on the surface of the liquid. The surface tension coefficient of the liquid is equal to o. The surface tension coefficient of oil at the air oil interface is o, and at the liquid oil interface is ,. If the radius of drop is equal to r. Find its thickness? e...........me . . (A) 2r (a,+a, -a)a' (B) 2 (o, +0,+a)(a' -(0,-0;)') (6, +0, +0)(a' -(0,-5,)') (C)r (D) 2r G -G+6 of +6, +6 0'-(0,-0,) 101+0,+6 0-(0,-0,)