Question

Two flat, parallel electrodes $2.5cm$apart are kept at potentials of$20V\mathrm{and}35V$. Estimate the electric field strength between them.

Short answer

The electric field strength is$\mathbf{600}\mathbf{}\mathit{V}\mathbf{/}\mathit{m}$

Step-by-step solution

Given information and formula used  

Given :

Distance between the electrodes : $2.5cm$

Are kept at potentials of : $20V\mathrm{and}35V$

Theory used :

The electric field will be equal to the potential difference divided by the distance between these potentials. That is to say,

$E=\frac{∆V}{d}$

Calculating the electric field strength between the two parallel electrodes 

Since we have : $E=\frac{∆V}{d}$

So, in our numerical example,

$E=\frac{35-20}{0.025}=\boxed{\mathbf{600}\mathbf{}\mathit{V}\mathbf{/}\mathit{m}}$