open loop voltage gain.
It is defined as the ratio of output voltage to differential input voltage.
A=Vo/Vd
Where, A = open loop voltage gain
Vo = output voltage
Vd = differential input voltage
angle of contact.
It is defined as the angle between the tangent to the liquid surface at the point of contact and solid surface inside the liquid is called as angle of contact The value of angle of contact depends upon (i) Nature of solid and liquid in contact (ii) Cleanliness of the surface in contact (iii) Medium above the free surface of liquid
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