passive components.
Those devices or components which do not require any external power source to operate in a electronics circuit are called passive components or devices.
e.g Resistor, capacitor,inductor etc.
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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