Differential amplifier.
A differential amplifier is a circuit that can accept two input signals and amplify the difference between these two input signals.
Look at the figure
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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