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## Homework Statement

Calculate the electric field given by a voltage drop of 1 V across an insulator with thickness 20 nm.

**2. The attempt at a solution**

I am not sure which formula to use in order to obtain the electric field. I think one should use the formula E=U/d, where E denotes the (absolute value of the) electric field, d=20 nm, and U=1V. Is that correct?