Question

7 The dielectric strength of polyethylene (i.e. the electric field value above which a spark will jump through the material) is
about
. The dielectric constant for polyethylene is 2.3. If polyethylene fills the gap between two metal plates 0.20 cm apart, how
large a voltage difference can be applied to the two plates before break down?
20 kV
36 kV
54 kV
60 kV


8 Two parallel plates of
each are given equal and opposite charges of
. The electric field within the dielectric material filling the space between the plates is
. Find dielectric constant of the material.
7.14
2.43
6.14
3.4