A charge q1 = −2.5 nC is initially a distance r1 = 5.7 cm away from a stationary charge q2 = +3.1 nC. An external agent then moves q1 from r2 to a distance r3 = 10.5cm away from q2. (d) What is the change in potential from r2 to r3? (e) What is the work the agent must supply?

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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.