A half-circle arc with a uniform charge distribution lies in the xy-plane, centered on the origin, and the field-point is at the origin. The half circle is entirely right (positive x-coordinates) of the y-axis. Which way is the E-field vector at the field-point?

How can you improve the percent yield of copper in this lab? check all possible strategies that will you do so. measure reactants precisely. stir to the reaction take place. chill the reactants before combining them. wait patiently until the reaction completes. make sure to recover as much copper as possible.