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#9A thin plastic ring of radius 0.05 m has been rubbed with a silk cloth, and has gained a net charge of?5 × 10?8coulombs, distributed uniformly over its surface. The ring lies in the x-z plane. A cubicalblock of copper with side length 0.07 m is placed with its center 0.12 m from the center of the rod, asshown in the diagram below. The copper block has a charge of 2 × 10?9coulombs(a) What is the electric ?eld at the center of the block due only to the charged ring? Express youranswer as a three-component vector.(b) What is the electric ?eld at the center of the block, due only to the charges in and on thecopper? Explain brie?y. Express your answer as a three-component vector