Consider the following situation: a charge of +9.0 nC is placed at x = –2.0 m. A second charge of –9.0 nC is placed at the origin, as shown in the diagram. The location labeled P has coordinates x = –1.0 m, y = –1.0 m. What is the magnitude of the electric field at point P (in N/C)?

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Q: density

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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.