Physics

Problem

An isolated parallel-plate capacitor initially carries a charge of magnitude

Q

on each plate. A dielectric slab with dielectric constant

\kappa>1

is completely inserted between the plates without any external connections. Which statement best describes the subsequent change in the potential difference

\Delta V

across the plates? a)

\Delta V

decreases to

\dfrac{\Delta V}{\kappa}

. b)

\Delta V

remains unchanged. c)

\Delta V

decreases to

\dfrac{\Delta V}{\kappa^{2}}

. d)

\Delta V

decreases to

\dfrac{\Delta V}{\sqrt{\kappa}}

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