A test charge of +3 μC is at a point P where an external electric field is directed to the right and has a magnitude of 4 x 106 N/C. If the test charge is replaced with another test charge of -3 μC, what happens to the external electric field at P ? (a) It is unaffected. (b) It reverses direction. (c) It changes in a way that cannot be determined.

Principles of Physics: A Calculus-Based Text
5th Edition
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter19: Electric Forces And Electric Fields
Section19.5: Electric Fields
Problem 19.4QQ: A test charge of +3 C is at a point P where an external electric field is directed to the right and...
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A test charge of +3 μC is at a point P where an external electric field is directed to the right and has a magnitude of 4 x 106 N/C. If the test charge is replaced with another test charge of -3 μC, what happens to the external electric field at P ? (a) It is unaffected. (b) It reverses direction. (c) It changes in a way that cannot be determined.

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