Calculate: a) The electric field E in air at a distance of 30 cm from a point charge q1 = 5×10−9 C b) The force on a charge q2 = 4 × 10−10 C placed 30 cm from q1 c) The force on a charge q3 = −4 × 10−10 C placed 30 cm from q1 (in the absence of q2).

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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.