## College Physics (7th Edition)

$C=\frac{\kappa\varepsilon_{0}A}{d}$ When $d'=\frac{d}{2}$, $C'=\frac{\kappa\varepsilon_{0}A}{\frac{d}{2}}=2\frac{\kappa\varepsilon_{0}A}{d}=2C$ When the distance of separation is cut in half, the capacitance is doubled.