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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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.