In electromagnetism, "'current density "'is the electric current per unit area of cross section.
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From the equation of continuity it is evident that for area of cross section being constant, discharge is maximum when the velocity of discharge is maximum . and from Ch�zy formula and Manning formula for a certain value of slope and surface roughness velocity is maximum when the hydraulic radius is maximum . and if we take area as constant hydraulic radius is maximum if the wetted perimeter is minimum.
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