Physics

Problem

Two parallel conducting plates are

4\,\text{mm}

apart and maintained at

1200\,\text{V}

. A

2\,\text{mm}

thick dielectric slab of relative permittivity

4

completely fills the space adjacent to one plate, leaving the remaining

2\,\text{mm}

as air. The potential difference is unchanged. What is the magnitude of the electric field in the air region? a)

3.0\times10^{5}\,\text{N C}^{-1}

9.6\times10^{5}\,\text{N C}^{-1}

4.8\times10^{5}\,\text{N C}^{-1}

1.2\times10^{5}\,\text{N C}^{-1}