 free-convect magnetohydrodynam flow porou flat plate free-convect magnetohydrodynam flow porou flat plate incompress flow electr conduct fluid porou plate constant suction veloc presenc transvers uniform strength investig gupta note problem gener account free convect bodi forc act parallel wall fluid assum semi-incompress usual addit obviou practic signific problem interest sens exact solut magnetohydrodynam equat electromagnet assumpt involv constant properti freedom excess charg 