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सिद्ध करो कि (a x b)x c=a x (bxc) यदि (cxa)xb=0
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When water is taken in a glass vessel, the free surface of the water near the walls is curved concave upward. ... When the liquid surface is curved concave upwards, the angle of contact is acute and when the liquid surface is curved convex upwards, the angle of contact is obtuse.
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Monopolistic competition characterizes an industry in which many firms offer products or services that are similar, but not perfect substitutes. Barriers to entry and exit in a monopolistic competitive industry are low, and the decisions of any one firm do not directly affect those of its competitors.
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