Two flat conductors are placed with their inner faces separated by 6.0 mm. If the surface charge density on one of the inner faces is 40 pC/m2, what is the magnitude of the electric potential differences between the two conductors?

Respuesta :

Explanation:

Relation between electric field and charge density is as follows.

           E = [tex]\frac{\sigma}{2 \epsilon}[/tex]

where,    [tex]\sigma[/tex] = charge density

              [tex]\epsilon[/tex] = permittivity of free space = [tex]8.85 \times 10^{-12}[/tex]

So,  [tex]E_{\text{outside}}[/tex] = 0

      [tex]E_{inside} = \frac{+\sigma}{2 \epsilon} - \frac{-\sigma}{2 \epsilon}[/tex]

or,     [tex]E_{inside} = \frac{\sigma}{\epsilon}[/tex]

Now, formula to calculate the potential difference of two conductors is as follows.

         [tex]V_{1} - V_{2} = \frac{\sigma \times d}{\epsilon}[/tex]

It is given that,

           d = 6.0 mm = [tex]6 \times 10^{-3} m[/tex]

        [tex]\sigma = 40 \times 10^{-12} C/m^{2}[/tex]

Hence, we will calculate the magnitude of the electric potential differences between the two conductors as follows.

        [tex]V_{1} - V_{2} = \frac{\sigma \times d}{\epsilon}[/tex]

                     = [tex]\frac{40 \times 10^{-12} \times 6 \times 10^{-3}}{8.85 \times 10^{-12}}[/tex]      

                     = 0.0271 volts

thus, we can conclude that value of the magnitude of the electric potential differences between the two conductors is 0.0271 volts.