What is Source charge ?
Answer:-
It is the charge distribution or a charged body whose electrostatic effect at a point away from it is to be analysed.For application of Coulomb's law the source charge has to be a point charge.
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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