/sci/ - Science & Math

For the boxed questions, I got that
d. E is 1/5 of its original size
e. E is 5 times its original size
But I don't know how to explain the why. I've used proportionality symbols in my explanation.
d. E ∝ 1/ε -> E is 1/5 its original size when ε = 5 compared to ε = 1 (for air)
e. ½(CV^2) -> ½((5area^2)/d)V^2 -> E ∝ ε -> E is 5 times its original size when ε = 5

Have I explained these thoroughly enough or is there something else I need to say? Feels like I'm waffling.