Consider horizontal parallel plates with a fix potential difference. The upper plate has a voltage difference of 30 V with a lower plate, and they are separated by 3 cm. You move the two plates carefully to a separation of 4 cm. What is the strength of the electric field between the plates? Answers 750 volts/meter.

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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.