Question: A parallel-plate capacitor consists of two square plates, size L L, separated by distance d. The plates are given charge Q. What is the

A parallel-plate capacitor consists of two square plates, size L × L, separated by distance d. The plates are given charge ±Q.
What is the ratio E_f/E_i of the final to initial electric field strengths if

(a) Q is doubled,

(b) L is doubled,

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