Description : Elaborate why the section of a sprue reduces downwards.
Last Answer : A sprue section reduces downwards to a smaller size at its bottom will create a choke which will help keep the sprue full of molten metal.
Description : lf the wire which is vertical to this page has electron flow downwards the conductor will have
Last Answer : lf the wire which is vertical to this page has electron flow downwards the conductor will have a counter-clockwise field in the plane of the paper