When two objects attract each other electrically, must both of them be charged? When two objects repel

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When two objects attract each other electrically, must both of them be charged? When two objects repel each other electrically, must both of them be charged?

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Related Book For  answer-question

The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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