A parallel-plate capacitor is constructed of two square plates, size L × L, separated by distance d. The plates are given charge ±Q. Let’s consider how the electric field changes if one of these variables is changed while the others are held constant. What is the ratio Ef/Ei of the final electric field strength Ef to the initial electric field strength Ei if:a. Q is doubled?b. L is doubled?c. d is doubled?

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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.