V= 2 1 k(asin()) 2 2Wasin()W(2a)sin() V= 2 ka 2 sin(), 2 4Wasin(), frac d d'theta, V= k a 2 sin(), 2 cos(), -4Wasin(), frac d d'theta =0 d d V=ka 2 sin()cos()4Wasin()=0 quad cos left(theta right) =0 quad quad quad quad quad quad theta =90deg cos()=0 =90 degrees equilibrium.
When wettability balances, the contact angle is known as the equilibrium contact angle.
The first prerequisite for an object to be in equilibrium is for the net force acting on it to be zero. Any direction has zero net force if net force is zero.
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