Magnetic induction.
Answer:-
Magnetic induction at any point inside a matter is defined as numbers of lines of force associated per unit area when area is held perpendicular to the lines of force.
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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