# Electric field from voltage drop

## 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?

cnh1995
Homework Helper
Gold Member

## 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?
Yes.