A 10-centimeter glass rod has a charge of +10 picocoulombs.  What is the electric field 3 centimeters away from the center of the rod?   2. What would the field be if the rod had the same charge density, but was a mile long?

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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.