Print name: Print Unity ID: Show your NCSU photo ID when you turn in your test. PY208M Practice Test 1 INSTRUCTIONS: This test is a sample and might...

#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 field at the center of the block due only to the charged ring? Express youranswer as a three-component vector.(b) What is the electric field at the center of the block, due only to the charges in and on thecopper? Explain briefly. Express your answer as a three-component vector