A parallel-plate capacitor is charged to a potential difference of and then…

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A parallel-plate capacitor is charged to a potential difference of

200\,\text{V}

and then disconnected from the battery. The initial electric field magnitude between the plates is

E_0

. A dielectric with dielectric constant

\kappa=2.5

is inserted so that it completely fills the space between the plates. What is the ratio of the new electric field magnitude

E

to the original field magnitude

E_0

? (a)

1.0

(b)

0.16

(c)

0.40

(d)

2.5