College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 15 - Electric Charge, Forces, and Fields - Learning Path Questions and Exercises - Multiple Choice Questions - Page 554: 13

Answer

(a) down

Work Step by Step

Electric field line depicts the path taken by positive charge. Thus if an electric force is acting vertically upwards, then the direction of electric field will be opposite to the direction of force acting on electron, which is downward. So, (a) is correct.
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